What is not included in informative text

Is the or in survivors a prefix or a suffix? ?

If an atom has no charge, what can we say about the subatomic particles in the atom? a) there will be the same number of protons and neutrons, but a different number of electrons. b) there will be the same number of electrons and neutrons, but a different number of protons. c) there will be the same number of protons and electrons.

After swimming for hours he was tired what is the personal pronoun in the sentence below