Pennies made after 1982 are made primarily of one element coated with a thin layer of copper that gives it the
appearance of pure copper. Use the evidence from your
experimental results and the table of densities to identify
which element might make up most of a penny.

"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."

the increase of protons   hope this