Ionic formulae: Key concepts in chemistry: Chemistry: GCSE (9:1), Atomic structure: Key concepts in chemistry: Chemistry: GCSE (9:1)

Ionic formulae: Key concepts in
chemistry: Chemistry: GCSE (9:1),
Atomic structure: Key concepts in
chemistry: Chemistry: GCSE (9:1)
Ion - ANSWER An atom or group of atoms that has a positive or negative charge.

Polyatomic ion - ANSWER An ion made of two or more atoms

Ionic compound - ANSWER A compound that consists of positive and negative ions

Formation of ionic compounds - ANSWER Metal gives electron(s) to non-metals

Ionic formula - ANSWER The simplest whole number ratio of the ions which form a
neutral ionic compound

Group 1 charge - ANSWER +1

Group 2 charge - ANSWER +2

Group 3 charge - ANSWER +3

Group 5 charge - ANSWER -3

Group 6 charge - ANSWER -2

Group 7 charge - ANSWER -1

Charges in an Ionic Compound - ANSWER Cancel one another out

Hydroxide ion - ANSWER OH-

Carbonate ion - ANSWER CO3 2-

Nitrate ion - ANSWER NO3-

Ammonium ion - ANSWER NH4+

Relative mass of a proton - ANSWER 1

Relative mass of a neutron - ANSWER about the same as that of a proton

Relative mass of an electron - ANSWER 1/1840

Relative charge of a proton - ANSWER +1

Relative charge of a neutron - ANSWER 0

Relative charge of an electron - ANSWER -1