Question

sketch the atomic structure of that element which is which are placed in period 3 and has valency 4​

Answer 1

Answer:

Electronic configuration.

Explanation:

As any element for example Oxygen. With atomic number 8.has configuration like.

1s^2, 2s^2 2p^4.

Here the shell number that is "2 in this case" represents the period number. And the valence electron which is above the last shell names "s, p, d, f, and valence electrons here are 2,4) by adding them we get the group number.

So, here Oxygen is placed in 2nd period and 16th group(as P block element's group is calculate by adding the valence electron + 10)