16) the mass number of an element whose atoms have 12 protons and 13 neutrons is_
a) 12
b) 13c) 25 d) 12.5

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

i don't know people like to fight everywhere rip.