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Consider the following elements. Group I A' B' → Period ↓ C' D' Which of the following is/are true about A', B', C' and D' ?

1. Order of atomic radii: B' < A' < D' < C'
2. Order of metallic character: B' < A' < D' < C'
3. Size of the element: D' < C' < B' < A'
4. Order of ionic radii: B' < A' < D' < C'

Correct answer: Order of atomic radii: B' < A' < D' < C'

Solution

The correct option reflects the trend in atomic radii across periods and groups in the periodic table, where atomic size generally increases down a group and decreases across a period from left to right. In this case, B' and A' are in the same period, while D' and C' are in the next period, leading to the stated order.

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