How to write electronic configuration

(i) State aufbau principle for filling of electron in orbitals in atom. (ii) write electronic configuration of (a) "Cr" (b) Fe^(+2)

An element has protons whose mass is equal to 23,881 , times that of an electron. Identify the element and write its electronic configuration.

Write down the electronic configurations of the Na (11)

Write down the electronic configurations of the K (19)

Write down the electronic configurations of the Cl^(-) (18)

What do you understand by the term electronic configuration of an element ? Write down the electronic configuration of oxygen (At No. = 8).

How are the metals an nonmetals classified on the basis of their electronic configurations ?