Atomic structure

Everything is made of atoms. Knowing the three subatomic particles, where they sit and their charges lets you read the periodic table and predict behaviour.

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The three subatomic particles

Protons — positive charge (+1), found in the nucleus.
Neutrons — no charge (0), found in the nucleus.
Electrons — negative charge (−1), orbiting in shells around the nucleus.

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1. Which particle has a negative charge?

2. The atomic number of an element tells you the number of…

3. An atom has a mass number of 23 and an atomic number of 11. How many neutrons does it have?

4. Why is an atom neutral overall?

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