DEMOCRITUS (470-380 BC) Proposed that matter could be cut down to its basic building blocks which he...
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Transcript of DEMOCRITUS (470-380 BC) Proposed that matter could be cut down to its basic building blocks which he...
![Page 1: DEMOCRITUS (470-380 BC) Proposed that matter could be cut down to its basic building blocks which he called ATOMSindivisible particles of matter.](https://reader035.fdocuments.in/reader035/viewer/2022062600/5a4d1b757f8b9ab0599b6b29/html5/thumbnails/1.jpg)
DEMOCRITUS
• (470-380 BC) Proposed that matter could be cut down to its basic building blocks which he called ATOMS—indivisible particles of matter
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ARISTOTLE
• (384-322 BC) All matter is made of “Earth, Air, Fire and Water” which he could prove (?) with the “green twig experiment” …. The type of matter you had was evident in the smallest amount you could see…..
• This “It is as I see it” scientific concept lasted for 2000 years.
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LAVOISIER
• Law of conservation of matter- mass is neither created or destroyed during ordinary chemical reactions or physical changes
• Invented the balance• Discovered oxygen
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JOHN DALTON
• (1809) He championed the ATOMIC THEORY by using atoms to explain
• Law of conservation of Matter • Law of definite proportions• Law of multiple proportions
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Atomic Theory
1. All matter is composed of extremely small particles called atoms.
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Atomic Theory
2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
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Atomic Theory
3. Atoms cannot be subdivided, created, or destroyed.
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Atomic Theory
4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
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Atomic Theory
5. In chemical reactions, atoms are combined, separated, or rearranged.
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BECQUEREL
• Discovered radioactivity
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BEN FRANKLIN
• Discovered electricity
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JJ THOMSON
• http://www.magnet.fsu.edu/education/tutorials/java/cathoderaytube/
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JJ THOMSON
• Discovered the electron using a Cathode Ray Tube
• When electricity is run through an evacuated tube, a light is produced. This light is deflected by a magnet. Since it is repelled by the negative pole, the particle must be negative.
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JJ THOMSON
• He reasoned that if negative particles exist, there must be positive ones.
• The electron is “swimming” in a sea of positive particles….evenly distributed --- +-+-+-
• He described the “Plum Pudding Model” of the atom.
• We aren’t familiar with Plum Pudding, so we will use a watermelon.
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JJ THOMSON
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JJ THOMSON
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MILLIKAN
• The Oil Drop Experiment—discovered the mass and charge on an electron.
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ERNEST RUTHERFORD
• Thomson’s student whose task it was to find the positive particle.
• The “Gold Foil Experiment” : alpha particles from a radioactive element was shot at a piece of gold foil. Geiger and Marsden made a counter of where the deflected particles would be.
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ERNEST RUTHERFORD
• http://micro.magnet.fsu.edu/electromag/java/rutherford/
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ERNEST RUTHERFORD
• Expectations: evenly distributed deflections when positive (+) hits positive (+)
• Results: Most of the alpha (+) particles went straight through! Only a very small number were deflected!
• Conclusion: Most of the atom is empty space with a dense, positive nucleus. These + particles were named protons.
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BOHR
• His task was to explain these crazy results• He proposed the “Solar System” model of the atom.
• Electrons, like planets, circle the nucleus, like the
Sun.• They must be constantly moving, like planets.• It only works for hydrogen.
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CHADWICK
• Thomson discovered the electron (-)• Rutherford the proton (+)• Chadwick discovered the neutral particle, the
neutron.• The neutron has a mass similar to the proton,
it is neutral, and it resides in the nucleus.
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MODERN ATOMIC THEORY
• Dalton’s “indivisible atom” is not part of today’s atomic theory because…….
• Dalton’s premise that all atoms are EXACTLY the same is not part of today’s atomic theory because…….
• YOU NEED TO KNOW WHY…….
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EINSTEIN & PLANCK
• Einstein discovered the photoelectric effect- when elements are heated, they always give off the same color of light.
• Planck’s work related light color and energy. • Together they reasoned that little packets of
energy (quanta) were responsible for these color changes.
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Louis de Broglie
• Proposed the Wave-Particle Duality theory…….(what does that mean?)
• Remember Planck and Einstein found that when elements are heated, they give off colors of light in little packets, quanta, of photons. (cont…..)
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• Well, light was thought to only be a wave…but it can do stuff. It can open your key lock, open the door at WalMart, do surgery on your eye!!
• The electron was thought to only be a particle (plum!) that can be plucked from one atom to another. But it can give off colored lights..
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HENCE>>>>>>>>>>• The Wave Particle Duality Theory means:
• Light is a wave that can act like a particle
• Electrons are particles that can act like a wave
Confused yet? It gets better……
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Erwin Schrodinger
• If an electron can act like a wave, I can treat its mathematics like a wave (water wave, sine wave, earthquake wave….)
• He developed mathematical equations to describe where the electrons could reside as it acts like a wave.
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Schrodinger’s equations
• Are too complex for us to even look at, but……
• This is one of the first times that the mathematical equation came BEFORE the experimental data to support it.
• With the equations in hand, we knew how to look.
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Werner Heisenberg• Schrodinger’s equations tell the area in which an
electron can roam as a wave.• But to see the “little guy”, you need light! This zaps
the electron with a photon so it moves! So he isn’t where you looked!!!
• Heisenberg’s Uncertainty Principle states you can NEVER know where the electron is AND how fast it is moving. One property, but not both….
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QUANTUM THEORY
• So what is it? • The idea that the electrons emit/absorb light
in little packets (quanta) of energy.• But it takes on bizarre characteristics being a
particle that acts like a wave.• For us, we just need to know a general idea of
where the electrons are…..
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Energy Levels
• According to quantum theory, the electrons move in regions at specific distances from the nucleus.
• We will call them energy levels.• The largest atom has 7 energy levels.• These levels have separate spaces which are
called orbitals.
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The Electron Hotel!
• Imagine an atom is like a hotel….• Then the energy levels are like floors of the
hotel…..• The orbitals are like rooms on a floor.
• Because some are nicer rooms than others, they cost more (not $, but energy)
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ELECTRON RULES:
1. Aufbau Principle: Enter the
atom from the lowest energy level and go up
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2. Pauli Exclusion PrincipleOnly 2 electrons may enter an orbital
and they must have opposite spin.
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3. Hund’s Rule:Electrons can enter orbitals with the same
energy one at a time with the same spin before they can double in with the opposite spin.
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• Hopefully we all have safely returned……………..
• We are ready to USE those last three rules.
• Have your periodic table ready!!!
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Electron Orbits
• The work of Bohr and the Quantum theorists have given us a picture of the electrons whizzing around the nucleus.
• The electron cloud exists as levels; these levels are shown on the periodic table (7 rows)
• Within each level (row), different shapes (spdf) due to differences in energy.
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Periodic Table: Periods/GroupsPeriods=Row or Energy level
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Periodic Table: Sections indicate type of orbital-s,p,d,f
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Electron Energy Orbitals: H
• 4p __ __ __• 3d __ __ __ __ __• 4s __• 3p __ __ __• 3s __• 2p __ __ __• 2s __• 1s __
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Orbital notation for N
• 4p __ __ __• 3d __ __ __ __ __• 4s __• 3p __ __ __• 3s __• 2p __ __ __• 2s __• 1s __
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Orbital notation for K
• 4p __ __ __• 3d __ __ __ __ __• 4s __• 3p __ __ __• 3s __• 2p __ __ __• 2s __• 1s __
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Orbital notation for Co
• 4p __ __ __• 3d __ __ __ __ __• 4s __• 3p __ __ __• 3s __• 2p __ __ __• 2s __• 1s __
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Electron configuration for B
1s2 2s2 2p1
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Electron configuration for Ni
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Electron configuration for Sg
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Noble gas Configuration
• Only show the configuration of the element’s row
• Put the noble gas from the previous row in [ ] followed by the complete row’s configuration.
• [He] 2s22p4 represents what element?• [Ar] 4s1 represents what element?
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Noble gas configuration for Sb
Since Sb is on Row 5, that is the only row we do. To show we have finished row 4, write [Kr] and then the configuration for row 5.
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Noble gas configuration for Ir
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Review: Orbital notation Mn
• 4p __ __ __• 3d __ __ __ __ __• 4s __• 3p __ __ __• 3s __• 2p __ __ __• 2s __• 1s __
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Review Electron configuration
Cu
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Review: Noble gas configuration
Au
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Review of The ATOM
• The atom is made of 3 major particles; many others found in nuclear reactors.– Proton is +, located in the nucleus, and is assigned
a mass unit of 1.– Electron is -, located in the electron cloud
surrounding the nucleus, and is assigned a mass unit of 0 (mass is ~1/2000 th the proton)
– Neutron is 0 charge (neutral), located in the nucleus, and is assigned a mass unit of 1.
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Atoms
• Neutral particles• The number of protons (+) = the number of
electrons (-)
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Isotopes
• Isotopes are particles that have a different number of neutrons, therefore, a different mass.
• The atomic mass on the periodic table is a weighted average of the isotopes of that element.
• Some isotopes are radioactive.
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Ions
• Ions are charged particles ( + or -) based on different numbers of electrons.
• Cations are + ions resulting from a loss of electrons.
• Anions are – ions resulting from a gain of electrons.
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The Periodic Table• A map of the building block of matter.
1IA
18VIIIA
11H
1.00797
2IIA Periodic Table 13
IIIA14
IVA15VA
16VIA
17VIIA
2He
4.0026
23
Li6.939
4Be
9.0122
5B
10.811
6C
12.0112
7N
14.0067
8O
15.9994
9F
18.9984
10Ne
20.179
311
Na22.9898
12Mg24.305
3IIIB
4IVB
5VB
6VIB
7VIIB
8 9VIIIB
10 11IB
12IIB
13Al
26.9815
14Si
28.086
15P
30.9738
16S
32.064
17Cl
35.453
18Ar
39.948
419K
39.102
20Ca40.08
21Sc
44.956
22Ti
47.90
23V
50.942
24Cr
51.996
25Mn
54.9380
26Fe
55.847
27Co
58.9332
28Ni58.71
29Cu63.54
30Zn65.37
31Ga65.37
32Ge72.59
33As
74.9216
34Se78.96
35Br
79.909
36Kr83.80
537
Rb85.47
38Sr87.62
39Y
88.905
40Zr91.22
41Nb
92.906
42Mo95.94
43Tc[99]
44Ru
101.07
45Rh
102.905
46Pd106.4
47Ag
107.870
48Cd
112.40
49In
114.82
50Sn
118.69
51Sb
121.75
52Te
127.60
53I
126.904
54Xe
131.30
655Cs
132.905
56Ba
137.34
57La
138.91
72Hf
178.49
73Ta
180.948
74W
183.85
75Re186.2
76Os190.2
77Ir
192.2
78Pt
195.09
79Au
196.967
80Hg200.59
81Tl
204.37
82Pb
207.19
83Bi
208.980
84Po[210]
85At[210]
86Rn[222]
787Fr[223]
88Ra[226]
89Ac[227]
104Ku[260]
105 106 107 108 109http://www.chemsoc.org/viselements/pages/periodic_table.html
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What does the periodic table tell you?
4
Be
9.012
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Mass Number
• The Atomic Mass shown on the periodic chart is the weighted average of the mass of all the nuclides of the element (we will get to that later) and is usually a decimal number.
• The mass number is a whole number. To count PEN, we will round the atomic mass to the nearest whole number.
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Counting PEN
• Protons are equal to the atomic number. They are the ID particles of the atoms.
• How many protons does Be have?
4
Be
9.0122
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Counting PEN
• Protons are equal to the atomic number. They are the ID particles of the atoms.
• How many protons does Be have?
4
Be
9.0122
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Counting PEN• Neutrons have a mass
nearly equal to the proton. The mass # = the sum of P + N; therefore, N = mass# - #P (At.#)
• What is the mass # for Be?
• How many neutrons does Be have?
4
Be
9.0122
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Count PEN for Ru
• Atomic Number?• Atomic Mass?• Mass Number?• P• E• N
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Counting PEN for isotopes
• Isotope notationC-14 or 14
6 C
The 14 represents the mass of the nuclide (the particular atom with a mass of 14). The C represented on the periodic table has an average mass of 12.01.
The mass number for C-14 is 14, not 12
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C-14
• Atomic number?• Atomic mass?• Mass number?• P• E• N
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3013Al
• Atomic number?• Atomic mass?• Mass number?• P• E• N
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Cf-249
• Atomic number?• Atomic mass?• Mass number?• P• E• N
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Ion: Al+3
• The Al ion has a +3 charge. Does it have more or less electrons than the atom?
• Atomic number?• Atomic mass?• Mass number?• P• E• N
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Ion: P5- or P-5
• The P ion has a negative 5 charge. Does it have more or less electrons?
• Atomic number?• Atomic mass?• Mass number?• P• E• N
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ReviewCount PEN
At.# At. Mass
Mass #
P+ E- N
Pu
Pu-239
Pu+2
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Average Atomic Mass
• The atomic mass on the periodic table is the weighted average of all isotope nuclides.
• All elements on Earth appear to have the same mix of these isotopes.
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Calculate the atomic mass of B (4 decimal places)
• The natural abundance of B exists as 19.78% B-10 and 80.22% B-11.
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Calculate the atomic mass of Sr (4 decimal places)
• The natural abundance of Sr exists as– 0.56% Sr-84– 9.86% Sr-86– 7.02% Sr-87– 82.56% Sr-88