Across
- 2. total number of protons and neutrons in a specific atom
- 5. smallest particle of an element that maintains the properties of that element
- 6. a property of a subatomic particle; positive (protons), negative (electrons), or neutral (neutrons)
- 7. a positively charged particle within the atomic nucleus; used to identify an element
- 10. particle a particle smaller than an atom, such as a proton, neutron, or electron
- 13. a characteristic of a substance that describes how it combines with other substances to form new ones
- 15. – a negatively charged particle in the electron cloud surrounding the atomic nucleus
- 16. the number of protons in the nucleus of an atom; used to determine an element's position in the Periodic Table
- 17. electron(s) located in outer energy level (electron shell)
- 18. a conceptual model in which the elements are organized according to their properties; often displayed as a chart
- 19. (families) the vertical columns on the Periodic Table
Down
- 1. – property of matter that can be observed without changing the composition or identity of the matter
- 3. the horizontal rows on the Periodic Table
- 4. a pure substance that cannot be broken down chemically into simpler substances
- 8. a (neutral) particle with no electrical charge within the atomic nucleus
- 9. the negatively charged space containing electrons that surrounds the atomic nucleus
- 11. mass average mass number of all atoms of an element (from particles in the nucleus)
- 12. the positively charged center of an atom containing the protons and neutrons
- 14. tendency of a substance to undergo chemical changes in a system