Question

Consider the following elements.

Which of the following is/are true about A',B',C'andD' ? A. Order of atomic radii: \( B' < A' < D' < C' \)
B. Order of metallic character: \( B' < A' < D' < C' \)
C. Size of the element: \( D' < C' < B' < A' \)
D. Order of ionic radii: \( B^{+} < A^{+} < D^{+} < C^{+} \)
Choose the correct answer from the options given below:

• A. A only
• B. A, B and D only
• C. A and B only
• D. B, C and D only

Answer 1

The Correct Option is B

To ascertain the veracity of statements concerning elements A', B', C', and D', we consult periodic trends:

1. Elements A' and B' are situated in the same period (row). Atomic radius typically diminishes from left to right across a period due to an escalating nuclear charge that draws electrons nearer to the nucleus.
2. Elements A', C', and D' reside in the same group (column). Atomic radius generally augments down a group as electron shells are added.

Let us evaluate each option:

1. Option A: Atomic Radii Order: \(B' < A' < D' < C'\)
   • This is accurate. As A' is positioned to the left of B' within the same period, it follows that \(B' < A'\). Furthermore, with D' and C' located below A', the relationship \(A' < D' < C'\) holds true.
2. Option B: Metallic Character Order: \(B' < A' < D' < C'\)
   • This is accurate. Metallic character decreases across a period and increases down a group. Consequently, we observe \(B' < A'\) and \(A' < D' < C'\).
3. Option C: Element Size: \(D' < C' < B' < A'\)
   • This is inaccurate. As previously stated, atomic size increases down a group and decreases across a period.
4. Option D: Ionic Radii Order: \(B^{+} < A^{+} < D^{+} < C^{+}\)
   • This is accurate, aligning with the general trends of atomic radii and accounting for the influence of ionic charge.

Therefore, the correct selections are: A, B, and D exclusively.