* All separate questions that I needs answers to* Thank you
What element has 12 electrons when the atom is electrically neutral?
What element is in the alkaline-earth metals group and has 20 protons?
This element has 7 electrons when the atom is electrically neutral?

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.

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.