when Zn0 becames Zn++, where do the 2 electrons that are lost come from?

They come from Zn.

Neutral ₃₀Zn has an electron configuration of 1s2 2s2 2p6 3s2 3p6 3d10 4s2. The two 4s electrons move to the oxygen atom (making it an oxide ion O⁼.

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