Set 1

Question 0

Ion

Answer 0

An ion is a positively or negatively charged atom or covalently bonded group of atoms.

Question 1

Isotopes

Answer 1

Atoms of the same element with different numbers of neutrons.

Question 2

Relative isotopic mass

Answer 2

The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12.

Question 3

Relative atomic mass

Answer 3

The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12.

Question 4

Relative molecular mass

Answer 4

The weighted mean mass of a molecule compared with one-twelfth of the mass of an atom of carbon-12.

Question 5

Relative formula mass

Answer 5

The weighted mean mass of a formula unit compared with one-twelfth of the mass of an atom of carbon-12.

Question 6

Oxidation number

Answer 6

An oxidation number is a measure of the number of electrons that an atom uses to bond with atoms of another element.