Answers to AQA GCSE Atomic Structure

AQA GCSE Atomic Structure

Practice Questions

1. State the names of the three subatomic particles present in and atom.

Protons, Neutrons and Electrons

2. The radius of a typical atom is 1 x 10-10m. Calculate the size of the radius of the nucleus.

The nucleus is 1/10000th the size of the atom.

1 x 10-10/10000 = 1 x 10-14m

3. Calculate the relative mass of the nucleus that is seen in the picture of the atom at the very top of this page.

There are 3 protons and 4 neutrons. Both protons and neutrons have a relative mass of 1. So, therefore total relative mass is 7.

4.State how many electrons as a maximum should be in the first, second and third energy levels of an atom.

First energy level holds up to two electrons, second or third energy level holds up to 8 electrons

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