an element X has mass number 4 and atomic number 2 write its electronic configuration of the number protons electrons and neutrons what is valency give reason

an element X has mass number 4 and atomic number 2 write its electroni

1.	an element X has mass number 4 and atomic number 2 write its electronic configuration of the number protons electrons and neutrons what is valency give reason
Answer» = 4p+n =42+n =4NEUTRONS =2e.c =2valency =0 as its OUTERMOST SHELL is FILLED