Question

34 (a) State the postulates of Neils Bohr's model of an atom.
(b) The K and L shells of an atom are completely filled. Find the total number of
electrons present in it and name the element.

(c) Name the sub atomic particle which had no charge and mass equal to proton.
Who discovered such a sub-atomic particle.
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Answer 1

a. Bohr's model of the hydrogen atom is based on three postulates: (1) an electron moves around the nucleus in a circular orbit, (2) an electron's angular momentum in the orbit is quantized, and (3) the change in an electron's energy as it makes a quantum jump from one orbit to another is always accompanied by the ...

b. The maximum number of electrons in first orbit or K-shell will be 2×12=2 and second orbit or L-shell will be 2×22=8. Hence, if K and L shell are full, the total number of electrons in the atom will be 2+8 = 10

c. chadwick discovered a sub atomic particle which has no charge

Neutron is the sub atomic particle which had no charge and mass equal to proton.