Define Mass number.
Write four postulates of Bohr's atomic model.
Write electronic configuration of the following
elements in the box diagram.
a) C b) O
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● Mass number, in nuclear physics, the sum of the numbers of protons and neutrons present in the nucleus of an atom.
● Postulates of Bohr's Model of an Atom
In an atom, electrons (negatively charged) revolve around the positively charged nucleus in a definite circular path called orbits or shells. Each orbit or shell has a fixed energy and these circular orbits are known as orbital shells.
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