Atoms, Ions and Compounds - Module 2.1.1 - Chemistry

Atoms, Ions and Compounds - Module 2.1.1 - AS Chemistry - OCR - pg 8-11.

Structure

• The atom = nucleus

- nucleus = protons and neutrons

• An electron = occupies region outside nucleus
• arranged in shells

Properties

• atoms = tiny
• therefore, compare masses using relative masses
• Proton mass - neutron mass
• Electron = negilible = 1/1836th the mass of a proton

• Proton is +
• electron is -
• neutron has no charge (neutral)

Neutrons can be seen a glue that holds the nucleus togetherdespite…