Periodic Table and Periodicity · Chemistry · TS EAMCET

In which of the following species, the ratio of $s$-electrons to $p$-electrons is same?

Identify the pair of elements in which the difference in atomic radii is maximum

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Identify the pair of element in which the number of $s$-electrons to $p$-electrons ratio is $2: 3$

Which of the following has the least electron gain enthalpy?