X and Y are two elements with similar properties that follow Newlands' Law of Octaves, and Y lies within the two octaves that follow X. The minimum and maximum number of elements between X and Y will be ______ and ______ respectively.
6 and 13
6 and 13 is correct.
Step 1 — In Newlands' arrangement every eighth element, counting from any element, repeats the properties of the first.
Step 2 — Nearest case: X at position 1 and Y at position 8, leaving 6 elements between them (positions 2 to 7).
Step 3 — Farthest case within two octaves: Y at position 15, leaving 13 elements between X and Y (positions 2 to 14).
Hence, 6 and 13.
Note: RRB did not award marks for this question in the official key.
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