1. Noble gases Jana Matoušková Eva Hýsková

2. Basic information  inert gases  oxidation number – 0  relatively unreactive  high ionization energies  negligible electronegativities negligible - zanedbatelný

3. Helium - He Atomic Number: 2 Atomic Mass: 4.002602 amu Melting Point: -272.0 °C Boiling Point: -268.6 °C Number of Protons/Electrons: 2 Number of Neutrons: 2 Crystal Structure: Hexagonal Density 293 K: 0.1785 g/cm3 Color: colorless

4. Helium - facts Date of Discovery: 1868 Discoverer: Pierre Janssen Name Origin: From the Greek word hęlios (sun) Uses: balloons, deep sea diving Obtained From: natural gas deposit, air

5. Neon - Ne Atomic Number: 10 Atomic Mass: 20.1797 amu Melting Point: -248.6 °C Boiling Point: -246.1 °C Number of Protons/Electrons: 10 Number of Neutrons: 10 Crystal Structure: Cubic Density 293 K: 0.901 g/cm3 Color: colorless

6. Neon - facts Date of Discovery: 1898 Discoverer: Sir William Ramsey and Morris Travers Name Origin: Form the Greek word neos (new) Uses: lighting Obtained From: liquid air

7. Argon - Ar Atomic Number: 18 Atomic Mass: 39.948 amu Melting Point: -189.3 °C Boiling Point: -186.0 °C Number of Protons/Electrons: 18 Number of Neutrons: 22 Crystal Structure: Cubic Density 293 K: 1.784 g/cm3 Color: Colorless Gas

8. Argon - facts Date of Discovery: 1894 Discoverer: Sir William Ramsey and Lord Rayleigh Name Origin: From the Greek word argon (inactive) Uses: Lighting Obtained From: air

9. Krypton - Kr Atomic Number: 36 Atomic Mass: 83.8 amu Melting Point: -157.2 °C Boiling Point: -153.4 °C Number of Protons/Electrons: 36 Number of Neutrons: 48 Crystal Structure: Cubic Density 293 K: 3.74 g/cm3 Color: colorless gas

10. Krypton - facts Date of Discovery: 1898 Discoverer: Sir William Ramsey and Morris Travers Name Origin: From the Greek word kryptos (hidden) Uses: Lighting Obtained From: production of liquid air

11. Xenon - Xe Atomic Number: 54 Atomic Mass: 131.29 amu Melting Point: -111.9 °C Boiling Point: -108.1 °C Number of Protons/Electrons: 54 Number of Neutrons: 77 Crystal Structure: Cubic Density 293 K: 5.8971 g/cm3 Color: Colorless Gas

12. Xenon - facts Date of Discovery: 1898 Discoverer: Sir William Ramsay and Morris Travers Name Origin: From the Greek word xenon (stranger) Uses: powerful lamps, bubble chambers Obtained From: liquid air

13. Radon - Rn Atomic Number: 86 Atomic Mass: 222.0 amu Melting Point: -71.0 °C Boiling Point: -61.8 °C Number of Protons/Electrons: 86 Number of Neutrons: 136 Crystal Structure: Cubic Density 293 K: 9.73 g/cm3 Color: colorless

14. Radon - facts Date of Discovery: 1900 Discoverer: Friedrich Ernst Dorn Name Origin: From radium Uses: treatment of cancer Obtained From: decay of radium

15. Thank you for your attention!  www.chemicalelements.com/groups/noblegases.html  www.geocities.com/nobleproj/1.html  en.wikipedia.org/wiki/Noble_gas