a.

Aluminium

b.

Copper

c.

Lead

d.

Iron

a.

Atomic weights

b.

Isotopic weights

c.

Molecular weights

d.

Atomic numbers

a.

Nearly equal masses of with a release of energy and radiation

b.

Equal masses with the release of energy

c.

Equal masses with a release of energy and radiation

d.

Unequal masses without any release of energy

a.

Haematite, malachite and limonite

b.

Chalcocite, calamine and bornite

c.

Magnetite, haematite and limonite

d.

Malachite, chalcocite and bornite