Consider elements:
A', B', C', D' where A' and B' are in Period 2, C' and D' in Period 3; A' and C' in Group 1, B' and D' in Group 2. Which of the following is/are true?

A. Order of atomic radii: B'

Question

Consider elements:
A', B', C', D' where A' and B' are in Period 2, C' and D' in Period 3; A' and C' in Group 1, B' and D' in Group 2. Which of the following is/are true?

A. Order of atomic radii: B' < A' < D' < C'
B. Order of metallic character: B' < A' < D' < C'
C. Size: D' < C' < B' < A'
D. Order of ionic radii: B'+ < A'+ < D'+ < C'+

Canvas Classes · Accepted Answer

Strategy:
 Relate the positions of elements ( Period 2;  Period 3) to the trends in atomic size, ionic radii, and metallic character. Metallic character increases down a group and from right to left across a period.

Step 1: Identify the elements
- Group 1: , 
- Group 2: ,

Step 2: Evaluate Statements
- A (Atomic Radius): Order: Group 2 < Group 1 and Period 2 < Period 3. Thus,  (). (True)
- B (Metallic Character): Follows the same trend as size. . (True)
- C (Size order): Claims . Incorrect, as

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