Chemistry IGCSE Topic 3: Atomic Structure

Isotopes , Relative Atomic Mass , Elements Compunds and Mixtures

Subatomic Particles

Protons, Neutrons, Electrons

Nucleon

Any subatomic particle found within an atomic nucleus (Protons, Neutrons)

Proton/Atomic Number

The amount of protons found in the nucleus and the amount of electrons in its atomic structure

Isotopes

Atoms with the same amount of protons and a different amount of neutrons in the nucleus

Relative Atomic Mass

The weighted average mass of an element's atoms, compared to 1/12th the mass of a carbon-12 atom

Relative Atomic Mass Formula

(Mass x Abundunce) + (Mass x Abundunce) / 100

Abundance

The relative quantity of a specific element, isotope, or compound

Element

A substance made of only one type of atom

Compound

A substance made of two or more different elements chemically combined in a fixed ratio

Mixture

Two or more substances (elements or compounds) that are physically mixed but not chemically bonded. They can be separated by physical methods

Monotomic

Consists of one atom

Diatomic

Consists of two atoms

Relative Charge of Proton

+1

Relative Charge of Electron

-1

Relative Charge of Neutron

0

Relative Mass of Proton

1

Relative Mass of Neutron

1

Relative Mass of Electron

1/1834