Across
- 2. process where some substances spontaneously emit radiation
- 5. high energy radiation that has no charge and no mass
- 8. ability of an atom to attract electrons when the atom is in a compound
- 10. the center-most part of an atom where the protons and neutrons are contained
- 11. the weighted average mass of an elements isotopes
- 12. energy required to remove an electron from an atom
- 13. device in which electrons travel as rays from negative to positive pole
- 14. atoms with the same number of protons but different numbers of neutrons
Down
- 1. one-half the distance between the nuclei of two atoms when the atoms are joined
- 3. radiation deflected toward the negatively charged plate
- 4. arrangement of electrons around atomic nucleus
- 6. equal to 1/12 the mass of a carbon-12 atom
- 7. The mass of this particle is 1/1840 of a hydrogen atom
- 9. the smallest particle of an element that retains the properties of that element