Bellwork (Get out Study Guide..and..)
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Transcript of Bellwork (Get out Study Guide..and..)
Bellwork (Get out Study Guide..and..)
1) Tear out sheet of paper from notebook.
2) Come up with three possible test questions. Write the answer on the back.
3) Trade with neighbor and see if they can answer them (without you telling them the answer
Study Guide: first page• Atomic Mass: mass of a specific isotope of an element
• Atomic Number: the number of protons in an element
• Mass Number: Protons + Neutrons
• Isotopes: forms of elements that have different number of neutrons
• Ions: charged atoms
• Valence electrons: electrons in the outermost shell
Study Guide: First Page Charge Location Mass
Proton Positive
Nucleus 1 atomic
mass unit
Neutron Neutral
Nucleus 1 atomic
mass unit
Electron Negative
Cloud 0.00054 amu
(small!)
Study Guide: First Page• Which particle defines the element? • Number of protons
• What charge does the nucleus of an atom normally have? • Positive
• What does it mean for an atom to be neutral? (Explain using the words proton, neutron, electron)• No charge. Number of protons= electrons. Neutrons
are not charged.• How are the electrons arranged in an atom? • In shells or orbitals based on energy level.
•Knowing that every periodic table is different, how do I tell which one thing is the atomic number?• It is the whole number (no decimals).
•Knowing that every periodic table is different, how do I tell which one thing is the atomic mass?• It is the decimal number. It is usually larger
than the atomic number.
• If you know an elements Atomic number, what else do you know about the element? (Assume the element is neutral)•Number of protons. If the element is
neutral, also the number of electrons.
•How do you get the mass number from the periodic table?•Round the average atomic mass.
Most of the time, though, you should add protons and neutrons.
Study Guide: First Page• Electrons do not travel in an orbit.
Explain this statement, using the words orbit, orbital, electron cloud, and energy level.
• Electrons are found approximately in the electron cloud and travel very quickly in orbits. They are found at different energy levels. Electrons closer to the nucleus have less energy because they are strongly attracted to the nucleus.
Isotopes and Ions• What do the numbers after the name of an element
represent? Ex. Magnesium – 26• Mass number. Ex) 26 is the number of protons plus
neutrons
In the example to the right, why don’t I have to include the number of protons before Magnesium? Ex. Magnesium – 26
The number of protons is always the same for a specific element (it is the atomic number)
Isotopes and Ions• Assume you have these 2 elements: 55
25Mn and 5625Mn
• How are these elements different from each other? • Different mass numbers
• What do we call these elements? • Isotopes
• How would you name each element? Manganese-55 and Manganese-56
Isotopes and IonsElement/Isotope Information
Write the Isotope Notation
Name the Element/Isotope
p = 19 , e= 19, n = 20
3919 K
Potassium-39
p=75, e=75, n = 111
18675 Re
Rhenium- 186p = 18, e = 18, n = 22
4018 Ar
Argon-40
•What is a cation?
• Positively charged atom (has lost electrons)
•Does a cation have a positive or negative charge?•Positive
•What is an anion?•Negatively charged atom (has gained electrons)
•Does an anion have a positive or negative charge?•Negative
substance symbol
Atomic number
=protons
Mass number
(P+N)
Protons Neutrons
(mass number- atomic number)
Electrons
Neutral orIon
IsotopeNotation
Aluminum Al-1 13 27 13 (27-13)
14
(13+1)
14
Ion
27
13 Al -1
Carbon C 6 (6 + 6)
12
6 6 6
NeutralP=E
12
6 C
Sodium Na+1 11 23 11 12 10
IonLost an electron (+)
23
11 Na+1
substance symbol
Atomic number
=protons
Mass number
(P+N)
Protons Neutrons
(mass number- atomic number)
Electrons
Neutral orIon
IsotopeNotation
Tin
Sn
50 119 50 119-50= 69
50
NeutralP=E
119
50 Sn
Barium Ba2+ 56 138 56 138-56= 82
54Ion
Lost two electrons
138
56 Ba 2+
IodineI
53 76+53=129
53 76 53NeutralP=E
12953 I
substance symbol
Atomic number
=protons
Mass number
(P+N)
Protons Neutrons
(mass number- atomic number)
Electrons
Neutral orIon
IsotopeNotation
Oxygen O2- 8 8+6=14
8 6 10
2- ion
14
8 O2-
Magnesium
Mg2+ 12 24 12 12 10
2+ ion
24 Mg +212
Chlorine Cl1- 17 37 17 2018
1- ion37
17 Cl1-
substance symbol
Atomic number
=protons
Mass number
(P+N)
Protons Neutrons
(mass number- atomic number)
Electrons
Neutral orIon
IsotopeNotation
BromineBr 35
7535 40
35
Neutral
75
35 Br