Atomic and Nuclear Phenomena

2. A phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
6. (Answer to Down 8) are composed of two protons and two neutrons; hence they are ____________.
10. High-energy electromagnetic waves.
11. All naturally occurring elements with atomic numbers greater than 83 are?
12. Can emit all the colors in an electromagnetic spectrum.
14. The spectrum of the electromagnetic radiation emitted or absorbed by an electron during transitions between different energy levels within an atom.
15. When an unstable ___________ disintegrates, it is said to undergo decay, releasing certain types of particles or high-energy photons

1. The spontaneous breakdown of an unstable atomic nucleus accompanied by the emission of particles and rays.
3. Consists of all wavelengths within a certain range.
4. Electrons which have negative charges and travel at nearly the speed of light.
5. Constituted by the frequencies of light transmitted with dark bands when energy is absorbed by the electrons in the ground state to reach higher energy states.
7. _________ of light absorbed is helpful in figuring out the number of substances in the sample.
8. Composed of two protons and two neutrons.
9. The interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.
13. Absorption Spectra is produced when _______ absorb energy.