The group of metals having the positive value of electron gain enthalpy is:

1.	Cr, Fe	2.	Mn, Zn
3.	Fe, Zn	4.	Cr, Mn

Percentage ionic character, if electronegativity value of X=2.1 & Y=3.0, is :-

The correctly matched option is:-

1. ${\mathrm{Fe}}^{+3}>{\mathrm{Fe}}^{+2}$ $>$ ${\mathrm{Fe}}^{+}$  : Order of atomic radius 

2. O > C > B > N   : Order of ionisation energy 

3. ${\mathrm{O}}^{-2}$ $<{\mathrm{O}}^{-}$ $<\mathrm{O}$ $<{\mathrm{O}}^{+}$ :  Increasing order of Z_eff

4. O < N < F < Ne  :  Order of electron affinity

The total number of 3rd period elements with more than one electron in a 3d orbital is:

Identify the INCORRECT match.

The atomic species that has the maximum ionization energy is : 

The outermost electronic configuration of the most electronegative element is :

In terms of increasing non-metallic character, which of the following is the
correct order for the elements N, P, O, and S?

1. P < S < N < O

2. O < S < N < P 

3. O < N < S < P 

4. N < S < O < P

The most non-metallic element among the given elements is

The correct order of metallic character of elements B, Al, Mg and K  is :