Element X reacts with chlorine to form the compound XCl3. In which group on the Periodic Table of the Elements is element X located?
- Mayya Alocci
- Sep 2
- 1 min read
Regents Chemistry Exam June 2025 Question 33
33 Element X reacts with chlorine to form the compound XCl3. In which group on the Periodic Table of the Elements is element X located?
(1) Group 1 (3) Group 13 (2) Group 2 (4) Group 18
Solution:
Ionic compounds are composed of a metal and a nonmetal. When writing the formula for ionic compound, the oxidation number (charges) get cross multiplied. Looking at the Periodic Table, chlorine has an oxidation number of -1. That is why X has no subscript next to it (meaning 1). Chlorine has 3 next to it, which means the charge for the metal is +3. Looking at the Periodic Table, Group 13 has +3 charge. Choice 3 is the correct answer choice.
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