Atomic Structure Revision

Atoms and the periodic table

1. What is the charge on a neutron?

2. What is the mass of an electron?

3. What is the positive particle in the nucleus called?

Atomic Structure Revision

1. What is the charge on a neutron?

0

2. What is the mass of an electron?

0 (only about 1/1840 of a proton’s mass)

3. What is the positive particle in the nucleus called?

Proton

Atoms and the periodic table

Atomic Structure Revision

1. Add the correct number of electrons to this diagram.

2. Label all of the fundamental particles of an atom.

3. Which element does this diagram represent?

Atoms and the periodic table

Atomic Structure Revision

1. Add the correct number of electrons to this diagram.

2. Label all of the fundamental particles of an atom.

3. Which element does this diagram represent?

He (helium)

Proton

Neutron

X

X

ElectronAtoms and the periodic table

Atomic Structure Revision

Each 1…. has its own proton number (also known as its 2…. number). This tells you the number of 3…. in the nucleus, which is the same as the number of 4…. in a 5…. atom.

The mass number tells you the number of 6…. and 7…. added together.

Atoms and the periodic table

Atomic Structure Revision

Each element has its own proton number (also known as its atomic number). This tells you the number of protons in the nucleus, which is the same as the number of electrons in a neutral atom.

The mass number tells you the number of protons and neutrons added together.

Atoms and the periodic table

Atomic Structure Revision

How many electrons, protons and neutrons

do the following atoms have?

(atomic (proton) numbers: H = 1, He = 2,

Mg = 12, U = 92)1H4He24Mg238U

Atoms and the periodic table

Atomic Structure Revision

How many electrons, protons and neutrons

do the following atoms have?

(atomic (proton) numbers: H = 1, He = 2,

Mg = 12, U = 92)1H p = 1, n = 0, e = 14He p = 2, n = 2, e = 224Mg p = 12, n = 12, e = 12238U p = 92, n = 146, e = 92

Atoms and the periodic table

Atomic Structure Revision

1.... are atoms with the same number of 2...., but a different number of neutrons.

Many 3.... have isotopes, for example, chlorine has 4.... isotopes, chlorine-35 and 5.....

Isotopes have the 6.... chemical properties, but 7.... physical properties.

Atoms and the periodic table

Atomic Structure Revision

Isotopes are atoms with the same number of protons, but a different number of neutrons.

Many elements have isotopes, for example, Chlorine has 2 isotopes, chlorine-35 and chlorine-37.

Isotopes have the same chemical properties, but different physical properties.

Atoms and the periodic table

Atomic Structure Revision

1. What is the definition of relative atomic mass?

2. Why do some elements have a R.A.M which is a decimal number?

3. What is the symbol for R.A.M.?

Atoms and the periodic table

Atomic Structure Revision

1. What is the definition of relative atomic mass?

The mass of an atom compared to 1 atom of 12C

2. Why do some elements have a R.A.M which is a decimal number?

It takes into account the proportions of each isotope

3. What is the symbol for R.A.M.?

Ar

Atoms and the periodic table

Atomic Structure Revision

1. Lead (atomic number 82) is in Group 4. How many electrons are there in the outer shell of a lead atom?

2. An iodine atom has 53 electrons. How many electrons are there in an iodide ion, and what charge does the ion carry?

Atoms and the periodic table

Atomic Structure Revision

1. Lead (atomic number 82) is in Group 4. How many electrons are there in the outer shell of a lead atom? 4

2. An iodine atom has 53 electrons. How many electrons are there in an iodide ion, and what charge does the ion carry? 54 electrons; 1 negative charge

Atoms and the periodic table

Atomic Structure Revision