An element A reacts with oxygen to form A2O. i] State the number of electrons in the outermost orbit of A. ii] To which group of the periodic table does A belong? iii] State whether A is a metal or a non-metal.

An element A reacts with oxygen to form A2O. i] State the number of el

1.	An element A reacts with oxygen to form A2O. i] State the number of electrons in the outermost orbit of A. ii] To which group of the periodic table does A belong? iii] State whether A is a metal or a non-metal.
Answer» Solution :i] Given that element A reacts with oxygen to FORM AO it means that two atoms of A REACT with one atom of oxygen and hence, A has a valency of I. ii] It BELONGS to the first group of the periodic table SINCE it has a valency of I. III] A is a metal.