Across
- 3. Metals in group 1, very reactive
- 4. Caused when the production of particles changes the amount of protons
- 5. Metals in group 2, less reactive than alkaline metals
- 8. Rare earth elements, follow the element lanthanum, located in top row of the section of the periodic table outside of the main body
- 10. Area around atom’s nucleus where electrons are most likely to be found
- 15. Elements in group 17, name means “forming salts” in Greek, very reactive nonmetals
- 16. Number of protons in an atom
- 17. Form of an atom w/ a different number of electrons
- 19. Elements in groups 3-12, generally less reactive than most other metals, properties vary based on the element
- 22. Ion w/ more electrons than protons
- 23. Elements 89-103, radioactive, not naturally occurring
- 24. Row of the periodic table organized by the atomic number
Down
- 1. Opposite properties of metals
- 2. Characteristic of a certain isotope, time taken to decay depends on half-life
- 6. Element w/ shiny appearance that conducts heat and electricity well
- 7. Center of an atom, has protons and neutrons
- 9. Particles w/ no charge
- 11. Ion w/ more protons than electrons
- 12. Column of the periodic table organized by similar properties
- 13. Have properties of metals and nonmetals, often make up semiconductors (materials that conduct electricity under some conditions)
- 14. Positively charged particles
- 18. Negatively charged particles
- 20. Form of an atom w/ a different number of neutrons
- 21. (Inert) Gases: Elements in group 18, almost never react w/ other elements