Chemical Elements.com - Rubidium (Rb)

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Basic Information

Name: Rubidium
Symbol: Rb
Atomic Number: 37
Atomic Mass: 85.4678 amu
Melting Point: 38.89 °C (312.04 K, 102.002 °F)
Boiling Point: 688.0 °C (961.15 K, 1270.4 °F)
Number of Protons/Electrons: 37
Number of Neutrons: 48
Classification: Alkali Metal
Crystal Structure: Cubic
Density @ 293 K: 1.532 g/cm³
Color: silver

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
Rb-81	4.57 hours
Rb-82	2.25 minutes
Rb-83	86.2 days
Rb-84	32.9 days
Rb-85	Stable
Rb-86	18.65 days
Rb-87	4.8E10 years
Rb-88	17.7 minutes
Rb-89	15.44 minutes
Rb-90	2.6 minutes
Rb-90m	4.3 minutes

Facts

Date of Discovery: 1861
Discoverer: R. Bunsen
Name Origin: From the Latin word rubidus (red)
Uses: catalyst, photocells
Obtained From: lithium production

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