Awarding brainliest! which is a characteristic of the part of the atom marked "a”? a) it contains most of the mass. b) it is negatively charged. c)it is mostly empty space. d)it is composed of electrons.

An atom is represented by

here we know that

z = number of protons which gives an idea of positive charge of atom

A = mass number

it is the sum of number of protons and neutrons of an atom which will help us to calculate the mass of the atom

So here mass number A will give us an idea about the mass of atom

so correct answer will be

A) It contains most of the mass.

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