Answer
$X_{2}S$
Work Step by Step
Valency of X ion is +1 and S ion is -2. So 2 atoms of element X are required to balance 2 electrons of S.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.