When a compound donates (loses) electrons, that compound becomes . Such a compound is often referred to as an electron donor.

Oxidized.

Explanation:

The complete sentence will be -

When a compound donates electrons, that compound becomes oxidized. Such a compound is often referred to as an electron donor.

The process of being a compound oxidized is termed as oxidation. In this process the oxidation state of the molecule, compound or atom is increased. It always occur in pair with the reduction and these two reactions are collectively termed as redox reactions. These redox reactions are the main source of energy in biological systems.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.