1.

Which of the following statements is`//are` correct ?A. `Z_("eff")` of elements increases along the period `(rarr)`.B. `Z_("eff")` of elements increases down the group `(darr)`.C. Isoelectronic species have the same nuclear charge.D. Screening constant `(sigma)` increases down the group `(darr)`.

Answer» Correct Answer - A::D


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