Choose the correct statements in reference to the photoelectric effect.
(A) There is no time lag between the striking of light and ejection of electrons from the metal surface.
(B) The number of electrons ejected is independent of the intensity of light.
(C) The elements $\mathrm{K}, \mathrm{Rb}$ and Cs can show photoelectric effect when exposed to the beam of light.
Assertion (A) Mo has the ground state electronic configuration $4 d^5 5 s^1$.
Reason (R) Mo has the highest exchange energy among the second row transition elements.
The correct option among the following is
Which of the following sequence is correct for decreasing order of ionic radius?
The successive ionisation energies (starting from the 1 st ) of an element are $801,2430,3660,25,000$ and $32,800 \mathrm{~kJ} \mathrm{~mol}^{-1}$, respectively. The element is
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