Antimony at Chemical Elements.com 


 

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

[Bohr Model of Antimony]  
Number of Energy Levels: 5

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 18
    Fifth Energy Level: 5

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)
Symbol Origin: Greek
Uses: hardens lead, plastics, chemicals
Obtained From: stibnite, valentinite