Chemistry GCSE: Atoms + Elements + Compounds + Mixtures

Electrons

________ have virtually no mass.

Isotopes

________ are different forms of the same elements, they have the same number of protons but different numbers of neutrons.

Elements

________ can exist as a number of different isotopes.

bonds

Making ________ involves atoms giving, taking or sharing electrons.

Relative atomic mass

________ is used to refer to the element as a whole, this is the average mass of the element.

Elements

________ are represented by a one or two letter symbols.

To get the number of neutrons just atomic number

mass number

Covalent Bonding

Each atoms shares an electron with another atom

Sum of ( isotope abundance x isotope mass number) / abundance of all the isotopes

Relative Atomic Mass

Nucleus Size

1 x (10)-14

Mixture

No chemical bond between different parts

Nucleus Symbol

Atomic number + mass number

Atomic Number

Proton Number

Mass number

Proton + Neutron Number

Neutron Number

Mass number - Atomic Number