You could say " It's him ! The man I saw following us." Or you could say " It's he who wants to go not I."
The public is correct. plural and singular verbs can be tricky... but you use a singular verb with a singular noun, and a plural verb with a plural noun. For example: The person (singular) is...
Corr.
Ba2Ba4 is technically correct, it's just that it would reduce to BaBr2
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