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The atomic number of Mercury(Hg) is 80; since atomic number of an atom= No. of protons.Thus No. of protons in Mercury is 80.

Also No. of protons = No. of electrons (In an neutral Atom; which is not an ion).Therefore No. of electrons is also 80.

Next, Mass number(Atomic Mass) of Mercury is 160.

Mass Number(Atomic Mass)= No. of Protons + No. of Neutrons.

Hence calculating that we get No. of Neutrons also to be 80.

FYI; Electrons have negligible mass so they are not included in calculating Mass of an atom, which only requires the nucleus which contains only protons and neutrons

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