Final answer:
Aluminum cation: Al³⁺, Lithium cation: Li⁺.
Explanation:
Aluminum (Al), with an atomic number of 13, will form a cation with a charge of 3+, denoted as Al³⁺, also referred to as an aluminum ion. Lithium (Li), with an atomic number of 3, will form a cation with a charge of 1+, denoted as Li⁺.
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