... the modern periodic table of elements? A) Bohr and Rutherford B) Plank and Rutherford C) Maxwell and Dalton D) Thomson and Crookes E) Mendeleev and Meyer Ans: E 15 Who stated that the elements, ... there is an equal number of protons, neutrons, and electrons D) the number of protons and neutrons is an even number E) the number of protons, neutrons, and electrons is an even number Ans: B What ... atom is the sum of the number of protons, neutrons, and electrons it contains C) The nucleus of an atom contains its protons and neutrons, and is positively charged D) The nucleus of an atom...