Chemistry

4. /A proton or neutron
6. /An interaction between elementary particles involving neutrinos or antineutrinos that is responsible for certain kinds of radioactive decay
7. /A radioactive isotope
11. /Electrons are emitted from solids, liquids or gases when they absorb energy from light
17. /The emission of energy as electromagnetic waves or as moving subatomic particles, esp. high-energy particles that cause ionization
18. /A distinct kind of atom or nucleus characterized by a specific number of protons and neutrons

1. /A positively charged particle ejected spontaneously from the nuclei of some radioactive elements
2. /A device for measuring radioactivity by detecting and counting ionizing particles
3. /A subatomic particle with the same mass as an electron and a numerically equal but positive charge
5. /The emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei
8. /Something emitted
9. /A charged particle that is emitted from the nucleus of a radioactive element during radioactive decay of an unstable atom
10. /The interaction that binds protons and neutrons together in the nuclei of atoms
12. /The time taken for the radioactivity of a specified isotope to fall to half its original value
13. /The action of changing or the state of being changed into another form
14. /The process or result of joining two or more things together to form a single entity
15. /Penetrating electromagnetic radiation of shorter wavelength than X-rays
16. /The action of dividing or splitting something into two or more parts