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Amongst the elements with the following electronic configurations, which one of them may have the highest ionisation energy?
1. $\left[Ne\right]$ $3s^2$ $3p^3$
2. $\left[Ne\right]$ $3s^2$ $3p^2$
3. $\left[Ar\right]$ $3d^{10}$ $4s^2$ $4p^3$
4. $\left[Ne\right]$ $3s^2$ $3p^1$

The correct order of increasing electron affinity for the elements, O, S, F and Cl is:

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?
1.  Ar < K⁺ < Ca²⁺
2. Ca²⁺ < Ar < K⁺
3. Ca²⁺ < K⁺ < Ar
4. K⁺ < Ar < Ca²⁺

First three ionisation energies (in kJ/mol) of three representative elements are given below:
Element     $I{E}_1$                    $I{E}_2$                   $I{E}_3$
P               495.8                4562                  6910
Q               737.7               1451                   7733
R               577.5                1817                  2745
Then incorrect option is :
1. Q: Alkaline earth metal.
2. P: Alkali metal.
3. R: s-block element.
4. All three: P,Q & R belong to the same period.

The process that requires absorption of energy is:
1. $N\to N^{-}$                       
2. $F\to F^{-}$
3. $Cl\to C{l}^{-}$                     
4. $H\to H^{-}$

The correct statement among the following regarding the element Unununium " is: 
1. It is an inner transition element.
2. It belongs to the 8th period in the periodic table.
3. It is a transition element.
4. It is a non-transition element.

If Z_eff of element having atomic number 11 is 2.2, then Z_eff of elements having atomic number 12 and atomic number 20 are respectively :-
1. 2.85, 3.92
2. 3.92, 2.85
3. 2.2, 2.2
4. None of the above

The radius of La³⁺ (at. no. 57) is 1.06 $\stackrel{°}{\mathrm{A}}$ The radius of Lu³⁺ (at.no. 71) might be:
1. 1.06  $\stackrel{°}{\mathrm{A}}$
2. 0.85  $\stackrel{°}{\mathrm{A}}$
3. 1.60  $\stackrel{°}{\mathrm{A}}$
4. 1.40  $\stackrel{°}{\mathrm{A}}$

Element/Ion that has the highest electron affinity is : 

Sodium generally does not show an oxidation state of +2, because of:
1. High first ionization potential.
2. High second ionization potential.
3. Large ionic radius.
4. High electronegativity.

An example of metalloid elements in the periodic table is:

Which of the following transition metal ions has the lowest density?
1. Copper
2. Nickel
3. Scandium
4. Zinc