Question

the atom of element has mass number 20 and atomi no 10 find number of proton electron and neutron wirte is electronic configuration what will be its valency

Answer 1

HEYA>>>>>>

________________________________________Atomic number(Z)-10;Mass number(A)-20
Number of proton=Number of electron=Atomic number.Hence there are 10 protons and 10 electrons.
The number of neutrons is 10

Electronic cinfiguration-2,8

Its valency is 0 as it is stable according to your question.

============================================Hope it helps

Answer 2

this is your answer