1.

Which of the following is true ?A. Neutron is a positively charged electronB. The magnetic moment of an atom is related to the number of unpaired electron in its electronic configurationC. Bohr theory can be succesifully modified to explain the electronic spectrum of multielectron atomD. The angle momentum of an eklectron in an atom is gives by `n ((h)/(2pi))`

Answer» Correct Answer - B
a. The neutrino has charge and seems to have rest mass equal to zero it is emitted along with the emission of a positron (possitive charge of` + le` and mass equal to electron) for example
`._(10)^(19) Ne rarr _(9)^(19)F + _(1)^(0)e + V`
Antineutrico is emitted along with the emmission of `beta ` particle
b. The expression of magnetic moment is
`mu_(m) = sqrt(n(n + 2)) mu_(B)`
d. The correct expressions is
`L = sqrt(l(l + 2)) ((h)/(2pi))`


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