Chemical Elements.com - Antimony (Sb)

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Basic Information

Name: Antimony
Symbol: Sb
Atomic Number: 51
Atomic Mass: 121.76 amu
Melting Point: 630.0 °C (903.15 K, 1166.0 °F)
Boiling Point: 1750.0 °C (2023.15 K, 3182.0 °F)
Number of Protons/Electrons: 51
Number of Neutrons: 71
Classification: Metalloid
Crystal Structure: Rhombohedral
Density @ 293 K: 6.684 g/cm³
Color: bluish

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
Sb-117	2.8 hours
Sb-119	38.1 hours
Sb-120	15.89 minutes
Sb-121	Stable
Sb-122	2.7 days
Sb-123	Stable
Sb-124	60.2 days
Sb-125	2.75 years
Sb-126	12.4 days
Sb-126m	19.0 minutes
Sb-127	3.84 days
Sb-129	4.4 hours

Facts

Date of Discovery: Known to the ancients
Discoverer: Unknown
Name Origin: From the Greek words anti (opposed) and monos (solitude), hence "not alone"
Symbol Origin: From stibium, the ancient name for antimony sulfide
Uses: hardens lead, plastics, chemicals
Obtained From: stibnite, valentinite

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