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qaws [65]
3 years ago
10

In the formula X2O5, the symbol X could represent an element in Group

Chemistry
1 answer:
topjm [15]3 years ago
6 0

Answer: (3) 15

Explanation: We criss-cross down the oxidation numbers to get the subscripts for the correct formulas. That means the X has an oxidation number of 5. The element with the + oxidation number is always written first so it is +5. Of the groups names, only group 15 has +5 as an oxidation number.

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