Answer
magnesium
lithium
Work Step by Step
By inspection of a metal activity series table, magnesium ranks higher than mercury.
By inspection of a metal activity series table, lithium ranks higher than potassium.
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.