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Answer:
(1)Most of the mass of the atom is concentrated in the nucleus, which has a positive charge. The positive charge in the nucleus is balanced by the negative electrons, making an atom neutral.
(2). An atom consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral.
(3)Atomic number and mass number are always whole numbers because they are obtained by counting whole objects (protons, neutrons, and electrons).
(4)Atoms are stables though negatively charged electrons are revolving within it because each atom contains equal numbers of protons and electrons. So, charge on negatively charged electrons are balanced by charge on positively charged proton. Therefore, atom is electrically neutral and stable
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