Across
- 4. rule atoms will gain, lose, or share electrons in order to have 8 electrons in their outer shell
- 7. vertical columns on the periodic table that indicate the number of valence electrons an atom has
- 9. a positively or negatively charged, covalently bonded group of atoms
- 10. number number of protons & neutrons in an atom
- 12. subatomic particle located in the nucleus of an atom that has a positive charge
- 13. smallest particle of an element which retains the properties of that element.
- 14. force that holds atoms together in a compound
- 15. when atoms transfer electrons in order to be stable
- 17. electrons e- in the outermost energy level of the electron cloud
- 18. charged atom that has gained or lost electrons
- 20. subatomic particle located in the nucleus of an atom that has a neutral charge
- 21. compound formed when 2 or more elements bond covalently.
- 22. Weighted average of all the isotopes of a particular element; number shown on periodic table; it is closest to the mass number of the most common isotope for the element
Down
- 1. atoms of the same element with different numbers of neutrons
- 2. particles that make up protons and neutrons
- 3. bond that results from the sharing of electrons between two nonmetals
- 5. formula tells what elements and how many of each element are in a unit of that compound
- 6. subatomic particle located in the electron cloud surrounding the nucleus that has a negative charge.
- 8. two or more elements chemically combined
- 11. number number of protons in an atom; identifies the element; periodic table is arranged by this number
- 16. the charge on an ion
- 19. horizontal rows on the periodic table that indicate the number of energy levels an atom has in in its electron cloud