How many protons can a nucleus hold

Stable nuclei with atomic numbers up to about 20 have an neutron:proton ratio of about 1:1 (solid line). Figure 1: permission from Wikipedia. The deviation from the N:Z=1 line on the belt of stability originates from a non-unity N:Z ratio necessary for total stability of nuclei

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answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

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