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Basic Information

Name: Xenon
Symbol: Xe
Atomic Number: 54
Atomic Mass: 131.29 amu
Melting Point: -111.9 °C (161.25 K, -169.42 °F)
Boiling Point: -108.1 °C (165.05 K, -162.58 °F)
Number of Protons/Electrons: 54
Number of Neutrons: 77
Classification: Noble Gas
Crystal Structure: Cubic
Density @ 293 K: 5.8971 g/cm³
Color: Colorless Gas

Atomic Structure

Number of Energy Levels: 5

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Isotopes

Isotope	Half Life
Xe-122	20.1 hours
Xe-123	2.0 hours
Xe-124	Stable
Xe-125	17.1 hours
Xe-126	Stable
Xe-127	36.41 days
Xe-128	Stable
Xe-129	Stable
Xe-129m	8.89 days
Xe-130	Stable
Xe-131	Stable
Xe-131m	4.9 days
Xe-132	Stable
Xe-133	5.24 days
Xe-133m	2.19 days
Xe-134	Stable
Xe-135	9.1 hours
Xe-135m	15.36 minutes
Xe-136	Stable
Xe-137	3.82 minutes
Xe-138	14.13 minutes

Facts

Date of Discovery: 1898
Discoverer: Sir William Ramsay
Name Origin: From the Greek word xenon (stranger)
Uses: powerful lamps, bubble chambers
Obtained From: liquid air

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