A. Its charge
Valency - Valency is the total number of atoms in the outermost shell of the atom. If the valence is completed it is known by two names one is octet and another one is duplet. Octet is when all 8 shells of the outermost shell of the atoms are filled the elements who have the full shell filled is called as Noble Gas for example Argon and Neon etc. Duplet is when the outermost shell of the atom can fill two atoms. Example: Helium it is the only noble gas having duplet filled.
Atomic Number - It is the total number of protons present in the atom.
Mass Number - It is the number of protons + the number of neutrons present in the nucleus of the atom.
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C. Mass number
The mass number is equal to the sum of the number of protons and neutrons where atomic number is just the same as protons since protons determine the atomic number.
The answer is c. Mass number.
Atomic mass, on the other hand, will be affected by a change in the number of neutrons for any element. Atomic mass takes into consideration the number of protons and neutrons in an atom.
the other 3 options have nothing to do with the mass of an element
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