The answer is: Nucleus (same as in plant cells)
People have learnt to make shelters in a way so that they don't get affected by natural disasters that are common in their area. For example, people make houses of complete brick so they are stronger and can withstand a powerful storm
Basically all it is a nucleus splitting into smaller fragments and these fragments are almost equal to half of the original mass
When an atom shares electrons they form a covalent bond.
Molarity = moles of solution/ liter of solution
4.32x10^2/20
432/20=
21.6 M