P 1. Elements X and Y react to form an ionic compound a formula XY. What could be the proton (atomic) numbers of X and Y? X | Y
A | 3 | 8
B | 6 | 8
C | 8 | 16
D | 12 | 16

the answer is C

Explanation:

This is because group6 elements are diatomic and when they are chemically combined their subscript 2 cancels out

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