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When a lithium atom forms an Li+ ion, the lithium atom
(1) gains a proton
(2) gains an electron
(3) loses a proton
(4) loses an electron

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atmosfears
4, loses an electron. a plus sign indicates an atom is losing an electron while a minus sign indicates an atom is gaining an electron
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Haikyuhengau

Answer:

(4) loses an electron

it has 3 protons and electrons, proton no. cannot change, to make lithium an ion, it needs to have an exact number of electrons so that the electronic shell can be 2, 8… something like that. So lithium atom loses an electron in order to for Li+ ion. Making the electrons to have 2 as an electronic shell.