There are 2 moles of NaCl. How many atoms of NaCl do you have?

 1x10^24 atoms NaCl

Explanation: You have to multiply the 2 moles of NaCl by Avogadro's number, which is 6.02x10^23. This will get you 1x10^24 atoms NaCl. There should be one sig fig in the answer.

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.