Across
- 2. High-energy, short-wavelength, electromagnetic radiation emitted from the nucleus of an atom.massnumber
- 7. the center of an atom
- 8. subatomic particle with the same mass as an atom
- 9. an atomic particle that occurs in the nucleus of every atom and carries a positive charge equal in size to the negative charge of an electron radioactivity.
- 10. two atoms combine to form a heavier atom that releases massive amounts of energy
Down
- 1. negatively charged particle identical to a high-energy electron.half-life
- 3. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 4. atoms are split apart and release energy
- 5. particles consisting of 2 protons and 2 neutrons tightly bound together
- 6. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei chain reaction.