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AQA - GCSE COMBINED SCIENCE: TRILOGY (Higher Tier)

Topic: Chemistry 1 - Atomic Structure and the Periodic Table

ATOMS:

All substances are made up of atoms, they have a radius of around 0.1nm (nanometers).

The Nucleus is in the middle of the atom, it contains protons (protons have a relative mass of 1 and a charge of +1 - this means it has a positive charge) and neutrons (neutrons have a relative mass of 1 and a charge of 0, it's neutral, that's why it is called neutron).

The nucleus has a radius of around