Question

Write atomic number,electronic configuration,no.Of valence electrons and valency of elements ranging from atomic no.1 to 20

Answer 1

you can check your answer

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