Question

Be and Al have following resemblance due to diagonal relationship :

• A. have nearly equal electronegativity.
• B. form amphoteric oxides.
• C. have same charge/radius ratio.
• D. both form dimeric halides.

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A have nearly equal electronegativity.
B form amphoteric oxides.
C have same charge/radius ratio.
D both form dimeric halides.

A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods of the periodic table These pairs (lithium(Li) and magnesium (Mg), berilium (Be) and aluminium (Al), boron (B) and silicon (Si) etc.)

Diagonal relationship is due to:

1) similar size

2) similar electronegativities.

3) similar charge/radius ratio.

4) Forming the nature of amphoteric oxides

Hence options A,B,C & D are correct.