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The correct sequence of electron gain enthalpy of the elements listed below is
A. Ar
B. Br
C. F
D. S
Choose the most appropriate from the options given below:

In case of isoelectronic species the size of \( \text{F}^- \), \( \text{Ne} \) and \( \text{Na}^+ \) is affected by:

Match List-I with List-II.

Choose the correct answer from the options given below:

If IUPAC name of an element is "Unununnium" then the element belongs to \( n \)th group of Periodic table. The value of \( n \) is ___________.

Given below are two statements:
Statement I: The metallic radius of \( \mathrm{Na} \) is \( 1.86 \, A^\circ \) and the ionic radius of \( \mathrm{Na^+} \) is lesser than \( 1.86 \, A^\circ \).
Statement II: Ions are always smaller in size than the corresponding elements.
In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements:
Statement (I): Both metals and non-metals exist in p and d-block elements.
Statement (II): Non-metals have higher ionization enthalpy and higher electronegativity than the metals.
In the light of the above statements, choose the most appropriate answer from the options given below:

Element not showing variable oxidation state is :

Given below are two statements :
Statement (I) : The \( 4f \) and \( 5f \) - series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement (II) : \( s \)-block elements can be found in pure form in nature.
In the light of the above statements, choose the most appropriate answer from the options given below :

The correct order of first ionization enthalpy values of the following elements is:
\( (A) \) \( \mathrm{O} \)
\( (B) \) \( \mathrm{N} \)
\( (C) \) \( \mathrm{Be} \)
\( (D) \) \( \mathrm{F} \)
\( (E) \) \( \mathrm{B} \)
Choose the correct answer from the options given below:

Given below are two statements:
Statement I: In group \( 13 \), the stability of \( +1 \) oxidation state increases down the group.
Statement II: The atomic size of gallium is greater than that of aluminium.
In the light of the above statement, choose the most appropriate answer from the options given below:

Given below are two statements:
Statement-I: Along the period, the chemical reactivity of the element gradually increases from group \( 1 \) to group \( 18 \).
Statement-II: The nature of oxides formed by group \( 1 \) elements is basic while that of group \( 17 \) elements is acidic.
In the light of the above statements, choose the most appropriate from the options given below:

Match List I with List II

The statement(s) that are correct about the species \( \mathrm{O}^{2-} \), \( \mathrm{F}^{-} \), \( \mathrm{Na}^{+} \) and \( \mathrm{Mg}^{2+} \).
(A) All are isoelectronic
(B) All have the same nuclear charge
(C) \( \mathrm{O}^{2-} \) has the largest ionic radii
(D) \( \mathrm{Mg}^{2+} \) has the smallest ionic radii
Choose the most appropriate answer from the options given below:

The electron affinity value are negative for:
A. \( \mathrm{Be \to Be^-} \)
B. \( \mathrm{N \to N^-} \)
C. \( \mathrm{O \to O^{2-}} \)
D. \( \mathrm{Na \to Na^-} \)
E. \( \mathrm{Al \to Al^-} \)
Choose the most appropriate answer from the options given below:

Given below are two statements:
Statement I: The correct order of first ionization enthalpy values of Li, Na, F and Cl is \( \mathrm{Na} < \mathrm{Li} < \mathrm{Cl} < \mathrm{F} \).
Statement II: The correct order of negative electron gain enthalpy values of Li, Na, F and Cl is \( \mathrm{Na} < \mathrm{Li} < \mathrm{F} < \mathrm{Cl} \).
In the light of the above statements, choose the correct answer from the options given below: