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1.Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. ... In a more realistic model, electrons move in atomic orbitals, or subshells.
2.The force that holds the electrons and protons together is the electromagnetic force. The number N tells you what element you have: for hydrogen N equals 1, for helium, 2, and so on. ... Much like a proton in mass but without electric charge, the neutron is essential for holding the nucleus together
3.The chemical properties of an atom are controlled by the numb er of electron s in the atom. ... Isotopes have the saem atomic number i.e. same number of electrons which are responsible for their chemical behaviour. Hence, these exhibit smililar chemical properties.