Question

If the atomic number of an element is 20. Calculate the number of electrons in its valence shell and its valency.
Please give me this answer as quick as possible .

Answer 1

Answer:

the valence is 2 gains and electrons are 20

Answer 2

If the atomic number is 20 that means number of protons also 20 and in an neutral atom , no. Of protons = No of electrons, this number of electrons will also be 20 .
Valency can be found by electronic configuration , as atomic number is 20 ,
It will be 2,8,8,2 . The valency will be 2 as it has 2 electrons in last shell .