Edexcel GCSE Combined Science CC1 Key concepts in chemistry overview quiz quiz

The number of neutrons

The number of protons and neutrons

The number of protons

The number of shells

Mass number added to the atomic number

Atomic number minus the number of electrons

Mass number multiplied by two

Mass number minus atomic number

Atoms of the same element with the same protons but different numbers of neutrons

Atoms of completely different elements that happen to share the same overall mass

Atoms of the same element that have different numbers of protons in the nucleus

Charged atoms that have gained or lost one or more of their electrons

They have exactly the same number of neutrons in the nucleus

They have the same number of electrons

They have exactly the same mass number as each other

They are actually two completely different elements

2, 9

2, 8, 1

8, 2, 1

2, 8, 8, 1

Covalent

Metallic

Ionic

No bonding

It has only weak intermolecular forces between its separate molecules

It contains a sea of delocalised electrons that are free to move

It is made up of small simple molecules with weak bonds between them

It has a giant ionic lattice held by strong electrostatic forces

The forces between the molecules are weak and easily overcome

The strong covalent bonds inside each molecule are weak and break easily

They are arranged in a giant lattice held by strong electrostatic forces

They contain a sea of delocalised electrons that are free to move about

A giant lattice of ions held by sharing electrons

Separate small molecules

Positive ions in a sea of delocalised electrons

Atoms with no bonding

The delocalised electrons lock the positive ions firmly into a rigid frame

They have only weak ionic bonds that snap apart when force is applied

They are made of small separate molecules with weak forces between them

Layers of ions can slide over each other without breaking the bonds

The same number of outer electrons

The same number of occupied electron shells

Exactly the same mass number as each other

The same number of neutrons in the nucleus

Diamond

Graphite

Sodium chloride when solid

Oxygen