Available Answers

1. 1.

   Define the term atomic number.

2. 2.

   Define the term mass number.

3. 3.

   Define the term electron.

4. 4.

   From the symbol ⁴₂He for the element helium, write down the mass number and the atomic number of the element.

5. 5.

   Sulphur has an atomic number of 16 and a mass number of 32. State the number of protons and neutrons present in the nucleus of sulphur.

6. 6.

   Give a simple diagram to show the arrangement of the electrons in an atom of sulphur.