Question

the atomic number of beryllium is 4 while that of oxygen is 8 .write down the electronic configuration of the two deduce their valency from the same

Answer 1

electronic configuration of beryllium is 2,2.
so valency of beryllium is 2.

electronic configuration of oxygen is 2,6
outermost shell needs 2 electrons to complete. so valency of oxygen is also2

Answer 2

Answer:

Explanation:

Atomic number of Beryllium = 4

Electronic configuration = (2, 2)

Atomic number of Oxygen = 8

Electronic configuration = (2, 6)

Valency of Beryllium is 2,

Valency of Oxygen is = 8 ‒ 6 = 2