Which of the following statements is//ar...

Which of the following statements is`//are` correct ?

`Z_("eff")` of elements increases along the period `(rarr)`.

`Z_("eff")` of elements increases down the group `(darr)`.

Isoelectronic species have the same nuclear charge.

Screening constant `(sigma)` increases down the group `(darr)`.

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The correct Answer is:

A, D

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