Across
- 2. a region at the center of an atom that contains most of the mass of the atom; made up of 2 kids of particles
- 4. columns used to classify elements by characteristics on the periodic table - there are 18
- 5. a positively charged particle in the nucleus of an atom
- 6. the sum of protons and neutrons in an atom
- 8. pure substances that cannot be broken into smaller substances
- 9. a negatively charged particle outside the nucleus of an atom
- 11. ability to be pulled out, or drawn into wires
- 13. how light reflects off a substance; how shiny it is
- 14. the number of protons in the nucleus of an atom
- 16. electrons with the highest energy level & located in the outermost energy level
- 17. a symbol, or 1-2 letter abbreviation, for an element
- 18. a substance that can carry electricity or heat
Down
- 1. a chart showing all 118 elements arranged according to repeating properties
- 2. an uncharged particle in the nucleus of an atom
- 3. a small particle that is the building block of matter
- 7. the ease and speed that an element combines, or reacts, with other substances
- 10. ability to be hammered or rolled into sheets or other shapes
- 12. substances that form when atoms from two or more elements bond together
- 15. rows in the periodic table - there are 7