Chemical Changes and Structure

Atoms, Elements and Compounds NAT 5

Homework Four

1.The table shows information about an ion.

Particle / Number
protons / 19
neutrons / 20
electrons / 18

The charge on the ion is

  1. 1+
  2. 1-
  3. 2+
  4. 2-

Question 2 and 3 refer to the following diagram.

2.Identify the particle which is a positive ion.

3.Identify the particle which is a negative ion.

4.Atoms of an element form ions with a single positive charge and an electron arrangement of 2,8.

The element is

  1. fluorine
  2. lithium
  3. sodium
  4. neon

5.Which of the following particles contains a different number of electrons from the others?

  1. Cl-
  2. S2-
  3. Ar
  4. Na+

6.Many chemical compounds contain ions.

Identify the compound in which both ions have the same electron arrangement as argon.

7.In which compound do both ions have the same electron arrangement as neon?

  1. magnesium oxide
  2. sodium sulphide
  3. calcium bromide
  4. calcium sulfide

8.A sample of silver was found to contain two isotopes,

(a) This sample of silver has an average atomic mass of 108.

What does this indicate about the amount of each isotope in this sample?

(b) Complete the table to show the number of each type of particle in this ion.

Particle / Number
proton / 47
neutron /
electron

9. a) Complete the table to show the number of each type of particle in this ion.

Particle / Number
proton
neutron /
electron

b) Why do atoms form ions?

10.The nuclide notation of a calcium ion is shown below:

20Ca

a)Complete the table to show the number of each type of particle in this ion

Particle / Number
proton
neutron /
electron

b)Complete the diagram to show how the electrons are arranged in a calcium ion.

(You may wish to use page 6 of your data booklet to help you).