Across
- 2. the total number of protons and neutrons in a nucleus
- 5. composite particles consisting of two protons and two neutrons tightly bound together
- 7. the number of protons in the nucleus of an atom of an element
- 8. the action of dividing or splitting something into two or more parts
- 9. an act of fusing or melting together
- 11. one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table
- 12. stable subatomic particle that has a positive charge equal in magnitude to a unit of electron charge
- 13. the second letter of the Greek alphabet ( Β, β ), transliterated as ‘b.’
Down
- 1. any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays
- 3. the release of energy from the decay of the nuclei of certain kinds of atoms and isotopes
- 4. the third letter of the Greek alphabet ( Γ, γ ), transliterated as ‘g.’
- 6. the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay
- 10. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen