A proton is on the x axis at x = 1.2 nm . An electron is on the y axis at y = 0.80 nm . Part A Find the net force the two exert on a helium nucleus (charge +2e) at the origin.

Two models of the same compound are shown. in what way is model b better than model a? model b shows the types of elements in the compound, but model a does not. model b shows the three-dimensional shape of the molecule, but model a does not. model b shows how the atoms in the molecule are connected, but model a does not. model b shows the number of atoms of each element in the molecule, but model a does not