Tum antiacids are made of calcium carbonate (CaCO3). Each Tums tablet contains 0.750 grams of Ca(CO3). If you eat 2 tums after a heafty Thanksgiving meal, how many moles of Calcium carbonate did you consume?

0.750 × 2 = 1.50 grams of Ca(CO3)

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.