Answer is:
Zr and Hf have about the same radius
Explanation:
In the vertical column of transition elements, the elements of second and third transition series resemble each other more closely than the elements of first and second transition series on account of lanthanide contraction.
Answer is:
9.84 x 105 J⁄mol
Answer is:
F > O > N (First IE)
Explanation:
On moving along the period, IE increases. But N has half filled structure, so it is more stable than O.