1) a lithium atom has 3 protons, 3 neutrons, and 3 electrons. which of the following sets of particles represents and (+1) ion of this atom? a)3 protons, 4 neutrons, and 3 electrons b)3 protons, 3 neutrons, and 2 electrons c)3 protons, 4 neutrons, and 4 electrons 2)which of the following scientists stated electrons travel around the nucleus like planets around the sun (planetary model)? a) john dalton b)ernest rutherford c)jj thomson 3) in thomson's "plum pudding model" of the atom , the plums represent a)atoms b)neutrons c)electrons