astronomy

1. the energy required to remove the electron from the atom
7. the smallest particle of a chemical element
8. with a positive electric charge
9. the analysis of Spectra
12. the difficult problem of ascertaining the actual positions and motions of stars
13. strongest recorded dark lines
15. used in measuring the distances to nearby Stars
16. Gives positive identification of the chemical elements that produced it

2. when an atom has the least possible energy
3. when the electron falls back down the atom radiates that energy in the form of a pellet of light called a
4. are produced when an atom of a chemical element absorbs light and the electrons jump out to higher energy levels
5. Or the spectrum of stars are absorption Spectrum
6. the distance to an imaginary star whose Parallax is one second of an arc (1”)
10. are produced when electrons jump from the higher energy levels back down to lower energy levels
11. apparent change in a star's position observed when the star is sighted from opposite sides of the Earth's orbit
14. which element has its own unique set of allowed electron orbits or…