GCSE Chemistry - Atoms & Ions #1

Atoms are the building blocks of everything and are made up of a central nucleus surrounded by electrons in shells.

The nucleus is made up of protons and neutrons, which have a relative mass of one, while electrons are much smaller and have a negative charge.

Atoms have a radius of around 0.1 nanometers and are mostly empty space.

Atoms can lose or gain electrons, becoming ions with a positive or negative charge.

The periodic table represents different elements, with each box providing information such as the elemental symbol, atomic number, and mass number.

The atomic number determines the number of protons and electrons in an atom, while the mass number helps calculate the number of neutrons.