Alithium ion is different than a lithium atom because it
a.
is much more massive.
b.
has an extra neutron.
c.
has a different electric charge.
d.
is in a different group in the periodic table.

I think the answer is C. a lithium ion is formed when the lithium atom loses an electron. the only thing that changes is the number of electrons so A,B and D cannot be correct.

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