Question

The atomic number of beryllium is 4. while that of oxygen is 8 Write down the electronie
configuration of the two and deduce the valency from the same. To which group and peroid do
they belong​

Answer 1

Answer:

Beryllium 2,2

Oxygen 2,6

Explanation:

To find the group an element is in you look at the last numbers in the electronic configuration.In this case beyllium is in group II because it has two valence electrons and oxygen is in group VI because it has six valence electrons on its outermost shell.Note briefly valence means the outermost shell.To know which period an element is in you look at the number of digits in the electronic configuration.Oxygen and beryllium are in the same period because they have the same number of digits which is two.That is period 2 The electronic configuration is very important.

Answer 2

Double give an answer isCorrect because That I am in number of Bareilly miss for an oxygen is it there is only presence of two electrons in S orbital and and remaining electrons are shifted to p orbital