| (i) Elements are in the increasing order of their atomic weights. |
| (ii) The atomic weight of the middle element is equal to the average of the atomic weight of extreme elements. |
| (iii) Elements in a triad have similar chemical properties. |
A) Only (i) and (ii)
B) Only (ii) and (iii)
C) Only (i) and (iii)
D) (i), (ii) and (iii)
Correct Answer: D
Solution :
Elements like calcium, strontium and barium from a triad based on the given characteristics.
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