Across
- 5. ....protons and neutrons, collectively called ____. (p61)
- 6. ...protons and neutrons are both themselves made up from more fundemental particles called _____. (p61)
- 9. The ____(Z)is defined as the number of protons.... (p62)
- 12. We now know that _______ are helium nuclei... (p60)
- 15. ____was the first person to assign chemical symbols... (p59)
- 16. ....when the British scientist ____ discovered that different metals produce a stream of negatively... (p60)
- 17. number of_____(p) = number of electrons = Z (p63)
- 18. _______, which have a charge equal and opposite to that of the proton,.... (p61)
- 19. Thomson's _____ model of the atom. (p60)
Down
- 1. All things are made from _______. (p57)
- 2. ...atoms are themselves made up from smaller or _____ particles. (61)
- 3. ______ are atoms of the same element with different mass numbers. (p63)
- 4. number of ____(n) = A-number of protons = A-Z (p63)
- 7. Dalton's picture of the atom as a ____ is the basis.... (p60)
- 8. The Danish physicist _____ pictured the hydrogen atom as a small solar "system", with... (p62)
- 10. The ______, given the symbol A, is defined as the number of protons plus... (p62)
- 11. _______'s model of the atom accounts for the experimental observation. (61)
- 12. Negative ions or_______ are formed when.... (p64)
- 13. When an atom loses electron it forms a positive ion or ____ as the number.... (p64)
- 14. ....tested Thomson's model by firing alpha particles at a piece of ______. (p60)