Identify the wrong statement in the following:

(1) Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius

(2) Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

(3) Atomic radius of the elements increases as one moves down the first group of the Periodic Table

(4) Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the Periodic Table

The ionisation energy will be maximum for the process:

1. $Ba\to B{a}^{2+}$

2. $Be\to B{e}^{2+}$

3. $Cs\to C{s}^{+}$

4. $Li\to L{i}^{+}$

The correct order of 3rd ionisation potential of Na, Mg, Al and Si is

1. Si > Al > Mg > Na

2. Mg > Si > Al > Na

3. Mg > Na > Si > Al

4. Mg > Na > Al > Si

Which of the following species exhibits the highest electron affinity?

1. F^–
2. O^–
3. O
4. Na

Which of the following pairs of species is isoelectronic?

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

The electronegativity values of elements X and Y are 2.1 and 3.0, respectively.
Calculate the percentage ionic character of the X–Y bond.

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

Which of the following pairs consists of elements that belong to the same period of the Periodic Table? 

Identify the incorrect match: