Question

4. How many electrons will be lost or gained by Aluminium and Oxygen to become stable?​

Answer 1

Explanation:

When aluminum, Al, loses 3 electrons its cation is show as Al3+. The 3 represents the number of electrons lost and the + indicates there is an excess of positive charge. Similarly, when oxygen, O, gains 2 electrons the anion is O2–.

Answer 2

Explanation:

History is the study of life in society in the past, in all its aspect, in relation to present developments and future hopes. It is the story of man in time, an inquiry into the past based on evidence.