In scandium series, maximum distance between neutrons containing site and valence shell is of :-

1. Sc

2. Mn

3. Fe

4. Zn

Which of the following ionisation energy order is NOT correct :-

(1) Cu⁺ > Cu⁺²

(2) Mn⁺² > Mn⁺³

(3) ${\mathrm{N}}^{+}$< ${\mathrm{N}}^{}$

(4) All of the above

Which of the following would not proceed in the forward direction spontaneously?

1. ${\mathrm{Si}}^{+}+\mathrm{Cl}\to \mathrm{Si}+{\mathrm{Cl}}^{+}$

2. $\mathrm{F}+{\mathrm{I}}^{-}\to {\mathrm{F}}^{-}+\mathrm{I}$

3. Both

4. None

Increasing order of ionic radii and decreasing order of number of protons of the given isoelectronic species is:-

1. Ca⁺², K⁺, Cl^-, S^-2

2. Cl^-, Ca⁺², K⁺, S^-2

3. S^-2, Cl^-, Ca⁺², K⁺

4. None of the above

In which of the following has maximum electronegativity:-

1. C

2. O

3. B

4. F

The electronic configuration of Palladium is:

1. [Rn] 5f³ 6d¹ 7s²

2. [Rn] 5f⁵ 6d¹ 7s²

3. [Rn] 5f² 6d¹ 7s²

4. None of the above.

Z_eff of Na⁺ and Na⁰ are respectively-

1. 1.95 and 1.22

2. 0.85 and 0.35

3. 1 and 0.35

4. 6.85 and 2.2

Removal of 2^nd electron is always :-

(1) Endothermic

(2) Endothermic for Mg, Be, N

(3) Exothermic for Mg, Be, N and noble gases

(4) Depends of electronic configuration

Atomic radius of Be, O, C, N, B are respectively (in pm) :-

(1) 111, 66, 77, 74, 88

(2) 74, 84, 111, 77,66

(3) 111, 88, 77, 74, 66

(4) 111, 66, 88, 77,74

The first four IP values of an element are 19, 190, 2000 and 2600 eV/atom. Element belongs to:-

(1) Amphoteric elements

(2) Four electron donor group

(3) s-block

(4) All of the above