chemistry true or false questions ????

Question

1.radioactivity results from changes in an stom's nucleus.
2. the force that holds nuclear particles together is called the electrical force.
3. gamma raidation cocsists of particles with a 2+ charge
4. in a cathoded ray tub, the cathode ray comes from the anode
5. an electron's mass is essentially 1 amu.
6. the number of protons in an atom is called its atomic mass
7. a(an) isotope is an atom or a group of atom having a net electrical charge.
8. an atom's mass number is the sum of its protons and nuetrons,

Answer 1

1.) True.
2.) False. It's the residual strong force.
3.) False.
4.) False. It comes from the cathode.
5.) False. Protons and neutrons are 1 amu, electrons are 5.485 * 10^–4 amu.
6.) False. Atomic mass is the essentially the number of neutrons + protons. The average atomic mass averages these by the number and commonality of each isotope.
7.) False. An isotope has a different # of neutrons.
8.) True.