Question

ANSWER IT FAST its urgent
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Answer 1

An atom is electrically neutral because it has equal number of electron and proton, and Atomic number=number of protons

So in the first one atomic number is 8 so protons and electrons will be 8 and mass number= total number of protons and neutrons so mass number=8+8

=16

now you know everything. Now you can solve by yourself. thankyou