Which one of the following statements is incorrect?

  • A
    Mass defect is related to binding energy.
  • B
    ‘Meson’ was discovered by Yukawa.
  • C
    The size of the nucleus is of the order of $10^{-12} - 10^{-13} \ cm$.
  • D
    Magnetic quantum number is a measure of ‘orbital angular momentum’ of the electron.

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"No two electrons in an atom can have the same set of all four quantum numbers." This principle is called:

The maximum number of sub-levels, orbitals and electrons in $N$ shell of an atom are respectively

On the basis of quantum numbers,justify that the sixth period of the periodic table should have $32$ elements.

The energy is lowest for the orbital :

The number of radial nodes in $3s$ and $2p$-orbitals, respectively are

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