Question

explanation- the atomic number of beryllium is 4 while that of oxygen is 8 . write down the electronic configuration of the two and deduce the valency from the same. to which group and period do they belong​

Answer 1

Answer:

The electronic configuration of beryllium is 1s2 2s2 and that of oxygen is 1s2 2s2 2p4.

The valency of beryllium is +2 and that of oxygen is -2.

Be belongs to 2nd group in 2nd period and O belongs to 16th group and 2nd period.

Hope it helps..

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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