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Answer:
1. Mass of an atom is contributed by mass of protons and mass of neutrons present inside the nucleus of an atom. Atoms of the same element contain the same number of protons but may differ in their number of neutrons. Therefore, an element has atoms with different mass numbers.
2. All the mass of an atom is concentrated in the nucleus because atom contains three subatomic particles like electron, proton and neutron. So, charge on negatively charged electrons are balanced by charge on positively charged proton. Therefore, atom is electrically neutral and stable.
3. Atoms are structurally stable because they are contained of three sub divisions, protons, electrons and neurons charged equally positive negetive and neutral respectively. protons and electrons are of equal and opposite charges...