Across
- 2. the amount of matter in an object
- 4. a row on the periodic table
- 6. a column on the periodic table
- 8. the ability of a substance to be hammered or rolled into sheets
- 9. the average Mass of the element's isotopes, weighted according to the abundance of each isotope
- 13. the way a mineral reflects or absorbs light at its surface
- 14. a neutral particle in the nucleus of an atom
- 15. an atom that is no longer neutral because it has lost or gained valence elctrons
- 16. a chart of elements arranged into rows and columns according to their physical and chemical properties
- 20. an element in group 2 on the periodic table
Down
- 1. the region surrounding an atom's nucleus where one or more electrons are most likely to be found
- 3. an element that is generally shiny, is easily pulled into wires or hammered into thin sheets,and is a good conductor of electricity and thermal energy
- 5. a process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radition
- 7. a nagatively charged particle that occupies the space in an atom outside the nucleus
- 10. the region in the center of an atom where most of an atom's Mass and positive charge are concentrated
- 11. the number of protons in an atom
- 12. an element in group 1 on the periodic table
- 17. the ability to be pulled into thin wires
- 18. a small particle that is the building block of matter
- 19. positively charged particle in the nucleus of an atom