Across
- 3. tiny particles that make up protons and neutrons
- 5. a vertical column on the periodic table
- 6. a variation of an atom
- 9. when an atom is apart of a covalent bond how badly does the atom want to hog the electron
- 10. the amount of time it takes for half of the radioactive atoms in an object to decay
Down
- 1. the energy required to remove an electron and make the atom positive
- 2. the number of protons in the nucleus of an atom
- 4. the weight of protons plus neutrons in the nucleus
- 7. substance with atoms that are all alike
- 8. a horizontal row on the periodic table