Antimony Atomic Number

  1. Antimony On Periodic
  2. Antimony Element
  • Antimony is a chemical element. It has the chemical symbol Sb. The symbol Sb is from the Latin name of 'stibium' for the element. It has the atomic number 51.
  • Electronegativity according to Pauling.
  • 2020-11-21 by Nick Connor Atomic Mass of Antimony Atomic mass of Antimony is 121.76 u.

Chemical properties of antimony - Health effects of antimony - Environmental effects of antimony

Antimony in the form of Antimony(III) sulfide, Sb2S3 was known to the ancients as early as about 3100 BC and was used by them as an eye cosmetic. Antimony was discovered by Basil Valentine of Germany in 1450. Basil Valentine described its preparation in his work 'Triumphal Chariot of Antimony' published in 1604. Antimony (Sb) Atomic Data for Antimony (Sb) Atomic Number = 51 Atomic Weight = 121.75 Reference E95: Isotope: Mass: Abundance: Spin: Mag Moment: 121 Sb: 120.903821: 57.3%: 5/2 +3.3592: 123 Sb: 122.904216: 42.7%: 7/2 +2.5466: Sb I Ground State 1s 2 2s 2.

Atomic number


Atomic mass

121.75 g.mol -1

Electronegativity according to Pauling




Melting point

631 °C

Boiling point

1587 °C

Vanderwaals radius

0.159 nm

Ionic radius

0.245 nm (-3); 0.062 nm (+5); 0.076 nm (+3)



Electronic Shell

[ Kr ] 4d10 5s25p3

Knives out french. Energy of first ionisation

834 kJ.mol -1

Energy of second ionisation

1595 kJ.mol -1

Energy of third ionisation

2443 kJ.mol -1

Standard potential

0.21 V ( Sb3+/ Sb)

Discovered by

The ancients


Antimony is a semimetallic chemical element which can exist in two forms: the metallic form is bright, silvery, hard and brittle; the non metallic form is a grey powder. Antimony is a poor conductor of heat and electricity, it is stable in dry air and is not attacked by dilute acids or alkalis. Antimony and some of its alloys expand on cooling.

Antimony has been known since ancient times. It is sometimes found free in nature, but is usually obtained from the ores stibnite (Sb2S3) and valentinite (Sb2O3). Nicolas Lémery, a French chemist, was the first person to scientifically study antimony and its compounds. He published his findings in 1707. Antimony makes up about 0.00002% of the earth's crust.


Very pure antimony is used to make certain types of semiconductor devices, such as diodes and infrared detectors. Antimony is alloyed with lead to increase lead's durability. Antimony alloys are also used in batteries, low friction metals, type metal and cable sheathing, among other products. Antimony compounds are used to make flame-proofing materials, paints, ceramic enamels, glass and pottery. The ancient Egyptians used antimony, in the form of stibnite, for black eye make-up.

Antimony in the environment

Antimony occurs naturally in the environment. But it also enters the environment through several applications by humans. Antimony is an important metal in the world economy. Annual production is about 50.000 tonnes per year, with virgin materials coming mainly from china, Russia, Bolivia and South Africa. World reserves exceed 5 million tonnes. In Finland there is a deposit of elemental antimony.

Health effects of antimony

Especially people that work with antimony can suffer the effects of exposure by breathing in antimony dusts. Human exposure to antimony can take place by breathing air, drinking water and eating foods that contain it, but also by skin contact with soil, water and other substances that contain it. Breathing in antimony that is bound to hydrogen in the gaseous phase, is what mainly causes the health effects.
Exposure to relatively high concentrations of antimony (9 mg/m3 of air) for a longer period of time can cause irritation of the eyes, skin and lungs.
As the exposure continues more serious health effects may occur, such as lung diseases, heart problems, diarrhea, severe vomiting and stomach ulcers.
It is not known whether antimony can cause cancer or reproductive failure.
Antimony is used as a medine for parasital infections, but people who have had too much of the medicine or were sensitive to it have experienced health effects in the past. These health effects have made us more aware of the dangers of exposure to antimony.

Effects of antimony on the environment

Antimony can be found in soils, waters and air in very small amounts. Antimony will mainly pollute soils. Through groundwater it can travel great distances towards other locations and surface waters.
Laboratory tests with rats, rabbits and guinea pigs have shown us that relatively high levels of antimony may kill small animals. Rats may experience lung, heart, liver and kidney damage prior to death.
Animals that breathe in low levels of antimony for a long time may experience eye irritation, hair loss and lung damage. Dogs may experience heart problems even when they are exposed to low levels of antimony. Animals that breathed in low levels of antimony for a couple of months may also experience fertility problems.
Whether antimony can cause cancer has not been fully specified yet.

Sources of periodic table.

Back to the periodic table of elements.

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Antimony is used to increase the hardness of alloys, with lead alloys for batteries, with lead/copper/tin alloys for machine bearings.

It is also used in automotive clutch and brake parts.

The other major use is as antimony trioxide which is used for the production of flame retardant chemicals.

Antimony is used in the semi-conducter industry for certain silicone wafer, diode and infra-red detector productions.

Antimony On Periodic

Small amounts are used in production of safety matches.

Antimony Element

How does antimony occur in the environment?

Antimony Atomic Number

Although not abundant, antimony can be found in over 100 species of minerals. Most commonly as stibnite.

Released to the atmosphere from natural sources and as a by-product of smelting lead and other metals, it generally drops to contaminate soils and waterways.

How does antimony affect human health?

Exposure to antimony occurs in the workplace or from skin contact with soil at hazardous waste sites. Breathing high levels of antimony for a long time can irritate the eyes and lungs, and can cause problems with the lungs, heart, and stomach, including vomiting, diarrheoa and stomach ulcers.

Exposure to high levels antimony from occurence in the workplace or contact with contaminated soils can cause difficulties with the heart, liver, lungs and stomach. It can also cause irritation to the eyes.

Left in direct contact with skin antimony can also cause irritation.