Fill in the blanks:
$(i)$ Atoms and ions having the same number of electrons are known as ........... .
$(ii)$ The quantitative measure of the tendency of an element to lose an electron is called ........... .
$(iii)$ The screening effect is also known by the name ........... .
$(iv)$ The enthalpy change when a gaseous neutral atom forms a negative ion is called ........... .

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(N/A) $(i)$ Isoelectronic species
$(ii)$ Ionization enthalpy
$(iii)$ Shielding effect
$(iv)$ Electron gain enthalpy

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Which of the following statements is incorrect?

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Which of the following statements is/are wrong?

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Match the following columns:
Column-$I$ Column-$II$
$A$. Ionisation potential $P$. $O < F < N$
$B$. Electronegativity $Q$. $N < O < F$
$C$. $Z_{eff}$ $R$. $O < N < F$
$D$. Electron affinity $S$. $N < C < O$

Match the column-$I$ with column-$II$
$A. S \rightarrow S^{-}$ $P. \text{Endothermic process}$
$B. N^{-} \rightarrow N$ $Q. \text{Exothermic process}$
$C. O^{-} \rightarrow O^{2-}$ $R. \text{Inert gas configuration in product}$
$D. P \rightarrow P^{-}$ $S. \text{Half filled configuration in product}$
Correct match is $:-$

In which of the following arrangements is the order $NOT$ according to the property indicated against it?

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