Atoms Crossword Puzzle

3. atomic theory / states that matter is composed of extremely small particles called atoms
4. / is a subatomic particle that has a mass nearly equal to that of a proton
8. / is a subatomic particle carrying a charge equal to but opposite that of an electron
10. Ray / is a high-energy radiation that possesses no mass and is denoted by the symbol Y
12. / atoms with the same number of protons but different number of neutron
13. decay / unstable nuclei lose energy by emitting radiation in a spontaneous process
15. negatively / charged particles that are part of all forms of matter
16. mass / the weighted average mass of the isotopes of that element

1. reaction / a reaction that involves a change in an atom's nucleus
2. / smallest particle of an element that returns the properties of the element
5. / tiny dense region in the center of the atoms
6. Particle / is an electron with a 1-charge
7. ray / a ray, originating from the cathode and traveling to the anode
9. / the rays and particles emitted by the radioactive material
11. / the process in which same substances spontaneously emit radiation
14. radiation / the radiation that was deflected toward the negatively charged plate
17. number / is the sum of the atomic number(or number of protons) and neutrons in the nucleus