No. The valence shell of each atom in the compound is filled, each achieving a noble gas configuration.
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One electron.
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The externall shell of electrons is completely filled.
When a compound is formed from two or more atoms of different elements, the chemical bonds that form cause the atoms in the compound to have filled valence shells.
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No, lithium loses one electron to form a compound. It is an alkali metal with an electron configuration of 1s² 2s¹, so it tends to lose one electron to achieve a stable electron configuration.
Members of the alkali metal family (Li, Na, K, Rb, Cs, Fr) each have one valence electron. Note: Hydrogen is often considered to be its own, separate family. It also has one inherently valent electron.
A proton never changes to an electron just as a dog never changes to a cat, they are completely different things really. In beta decay a neutron may decay into a proton and emit and electron and an anti-neutrino but that is about it.