1. | exhibit +2 and +3 oxidation states. |
2. | have \(4 f^5 6 s^2 \) and \(4 f^6 6 s^2\) electronic configurations, respectively. |
3. | have \(4 f^7 6 s^2\) and \(4 f^8 6 s^2\) electronic configurations, respectively. |
4. | have same atomic radii. |
List-I (Element) |
List-II (Most Common oxidation state/s) |
||
A. | \(\mathrm{Fe}\) | I. | +2, +7 |
B. | V | II. | +3, +2 |
C. | \(\mathrm{Mn}\) | III. | +4 |
D. | \(\mathrm{Ti}\) | IV. | +5 |
Assertion (A): | Ionisation enthalpies of early actinoids are lower than for early lanthanoids. |
Reason (R): | Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |