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Nobel Gases
Also known as inert gases. They are the last group, i.e. group 8, in the period table. As they belong to the same group they have the same physical and chemical properties. They have a stable electronic configuration by having an octet in their outermost shell, under normal condition they are odorless, colorless, tasteless monatomic gases. All of them has a closed subshell, a p subshell which is tightly bound (for helium, it has only s orbital).They are chemically inert and so dont form chemical bonds with other atoms. They are only VanderWaals forces of attraction between them. As they dont have have any valence electrons they have have high ionization energies and poor conductivity. With low boiling points, they are gases at room temperature.
Helium
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Helium, atomic number , has the following properties
Atomic Weight 4.0060g
Melting Point -7.75 °C (5atm)
Boiling Point -68.8 °C
Density 0.1787g/L at 7.15K & 1atm
Oxidation States 0
Electronic Configuration 1s
Facts
Date of Discovery 185
Discoverer Sir William Ramsey
Name Origin From the Greek word hêlios (sun)
Uses balloons, deep sea diving
Obtained From natural gas deposit, air
Neon
Neon, atomic number 10, has the following properties
Atomic Weight 0.177g
Melting Point -48.587°C
Boiling Point -46.054°C
Density 0.01 g/L at 7.15K & 1atm
Oxidation States 0
Electronic Configuration [He]sp6
Facts
Date of Discovery 188
Discoverer Sir William Ramsey
Name Origin Form the Greek word neos (new)
Uses lighting
Obtained From liquid air
Argon
Argon, atomic number 18, has the following properties
Atomic Weight .48g
Melting Point -18.5°C
Boiling Point -185.°C
Density 1.784 g/L at 7.15K & 1 atom
Oxidation States 0
Electronic Configuration [Ne]sp6
Facts
Date of Discovery 184
Discoverer Sir William Ramsey
Name Origin From the Greek word argon (inactive)
Uses Lighting
Obtained From air
Krypton
Krypton, atomic number 6, has the following properties
Atomic Weight 8.80g
Melting Point -157.85°C
Boiling Point -15.5°C
Density .74 g/L at 7.15K & 1 atom
Oxidation States 0
Electronic Configuration [Ar]d104sp6
Facts
Date of Discovery 188
Discoverer Sir William Ramsey
Name Origin From the Greek word kryptos (hidden)
Uses Lighting
Obtained From production of liquid air
Xenon
Xenon, atomic number 54, has the following properties
Atomic Weight 11.g
Melting Point -111.758°C
Boiling Point -108.1°C
Density 5.8g/L at 7.15K & 1 atom
Oxidation States 0
Electronic Configuration [Kr]4d105sp6
Facts
Date of Discovery 188
Discoverer Sir William Ramsay
Name Origin From the Greek word xenon (stranger)
Uses powerful lamps, bubble chambers
Obtained From liquid air
Radon
Radon, atomic number 86, has the following properties
Atomic Weight .0176g (approximate value)
Melting Point -71°C
Boiling Point -6°C
Density .1g/L at 7.15K & 1 atom
Oxidation States 0
Electronic Configuration [Xe]4f145d106sp6
Facts
Date of Discovery 188
Discoverer Fredrich Ernst Dorn
Name Origin From radium
Uses treatment of cancer
Obtained From decay of radium
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