Across
- 1. In the third period of the periodic system from Na to Ar, the atom of the first element has an outer electron
- 4. sodium to magnesium to aluminum causes atoms to be
- 6. one of the period 3 elements of the S-block member
- 7. chlorine appears between fluorine and
- 8. a liquid metal that does not have a solid metallic luster at temperature and pressure
- 10. atomic number of sodium
- 11. all period 3 elements have at least how many stable isotopes
- 12. Argon is the third-most .... gas in earth's atmosphere
- 14. symbol of silicon
Down
- 2. the chemical element with the symbol S and atomic number 16
- 3. The strongest oxidizing property in the third period is owned by
- 4. which is a soft, silvery white and highly reactive metal
- 5. phosporus available as a
- 9. yellow-green gas at room temperature
- 13. Period 3 elements are in the...rows of the periodic table