What is equal to the number of protons in an atom?

protons = electrons

They must be equal for an atom to be balanced. Otherwise, the atom is either positive (+) or negative (-).

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"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."