Across
- 2. The time it takes for the radiation or activity in an element to decrease to half its original value
- 4. A group of elements that have similar properties
- 9. The combining of nuclei to form a bigger and heavier nucleus
- 10. A particles found in the nucleus of an atom that has a positive charge
- 11. Patterns in the properties of chemical elements through a period such as electonegativity
- 13. States that lower electron orbital must be filled before electrons can be added to higher orbitals
- 15. States that lower electron orbital must be filled before electrons can be added to higher orbitals
- 17. The name given to a horizontal row of the periodic table
- 18. A column of elements in the periodic table
- 19. A type of particle that is given of during radiation as a Helium element
Down
- 1. Type of radiation in which unstable atomic nuclei spontaneously give off extra energy
- 3. The measure of the tendency of an atom to attract a bonding pair of electrons
- 4. A particle with a negative charge that is found around the nucleus
- 5. States that an orbital can contain a maximum of two electrons
- 6. Two or more forms of the same element that have equal numbers of protons but different numbers of neutrons
- 7. The splitting of a heavy nucleus into lighter nuclei
- 8. Every orbital in a subshell is occupied with one electron before an orbital is doubly occupied
- 12. Decay in which a neutron in an atom's nucleus turns into a proton and an electron is given off as radiation
- 14. The distance between crests of a wave
- 16. The net positive or negative charge of an element or molecule due to the loss or gain of a valence electron