If an atom of hydrogen loses its electron, what is its charge? a. -1 b. 0 c. +2 d. +1 (i know it's not the first two, i'm just confused because hydrogen has one proton and one electron but has a charge of +1)

Since it is specifically stated that the hydrogen is an atom and not an ion, therefore it is written simple as H (not H+). So since an atom of Hydrogen (H) has one proton and one electron and it loses its electron, therefore it is left with one proton, therefore now it becomes an ion of H+.

So answer is its charge is +1.

D. +1

the answer is b. dilution