Question

) Write the answers with explanation.
The atomic number of beryllium is 4, while that of oxygen is 8. Write down the electronic
configuration of the two and deduce their valency from the same.​

Answer 1

Answer:

Answer. 2 electrons are in the outermost shell so to complete its duet it will donait 2 electrons. 6 electrons are in the outermost shell and to complete its octet it needs 2 electrons. hence its valency is -2.

Answer 2

Answer:

Beryllium...E.C =2,2 it loose 2 electrons for completing his orbit then its valency is 2. Be to the power +2

and Oxygen....E.C=2,6 it gains 2 electrons for completing his orbit the it's valency is 2 . O to the power-2