Across
- 2. used in measuring the distance to nearby stars
- 4. state the least possible energy
- 6. levels each element has its own unique set of electrons
- 9. the distance to an imaginary star whose parallax is 1 second or arc
- 11. energy the energy required to remove it from the atom
- 14. spectra the spectrums of stars
- 15. longer wavelengths
- 16. atom radiates that energy in the form of a pellet of light
- 17. the analysis of spectra
Down
- 1. lines the strongest dark lines
- 3. smallest particle of a chemical element
- 5. atom which is positive
- 7. state when atom is unstable
- 8. velocity motion through space
- 10. spectrum positive identification of the chemical element that produced it
- 12. lines are produced when electrons jump higher energy levels
- 13. stars wavelengths shorter