Across
- 4. membrane-bound organelle that contains the cell's chromosomes.
- 5. Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay, or, equivalently, the time ...
- 8. the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
- 9. 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.
- 10. a subatomic particle of about the same mass as a proton but without an electric charge
- 11. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
- 12. protons + neutrons
- 13. a series of events so related to each other that each one initiates the next.
Down
- 1. High-energy, short-wavelength, electromagnetic radiation emitted from the nucleus of an atom
- 2. composite particles consisting of two protons and two neutrons tightly bound together
- 3. negatively charged particle identical to a high-energy electron.
- 4. the process by which two light atomic nuclei combine to form a single heavier one while releasing massive amounts of energy
- 6. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
- 7. atoms are split apart, which releases energy