Across
- 3. the _________ of an element are always the same
- 10. the vertical rows of the periodic table are called
- 12. _________ earth metals
- 13. the subatomic particle involves in chemical reactions
- 14. the most reactive metal
- 15. the most reactive group of non-metals
- 16. the _______ number tells you the number of protons and neutrons in an atom
Down
- 1. the atomic number for an atom tell you the number of ________ in the nucleus
- 2. number of electrons in the first shell
- 4. the charge of an electron
- 5. the lightest element
- 6. a full electron shell usually has how many electrons
- 7. type of chemistry involving carbon
- 8. noble gases have a ________ valence shell
- 9. the _______ shell is the outermost group of electrons in an atom
- 11. the horizontal rows of the periodic table are called