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lorena123:

Help pls (pic in chat)

lorena123:

Vocaloid:

Old question, but just in case you still need help - The innermost shell can hold up to 2 atoms (less than that = incomplete) Shells after that can hold up to 8 (less than that = incomplete) If an atom has a complete outer shell, it's generally unreactive. So you should look for the atom that has an incomplete outer shell.

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