Antimony-Element

Antimony Element

Introduction to Antimony Element

Antimony is a metalloid located in group number 15 and period number 5 of the periodic table. The atomic number of antimony is 51 whereas its atomic mass is 121.760. The single neutral atom of antimony contains 51 electrons. There are 51 protons and 70 neutrons in its nucleus. Antimony is represented by the symbol “Sb” from its foreign name Stibium.

Naming and History

The name antimony comes from the two Greek words “anti” and “monos” which means “not alone”. This was named because antimony is rarely found as a free element. Most of the time it occurs in a combined form with copper, silver, lead, etc.

Antimony has been known to man since ancient times. There was a discovery of an antimony vase in Paris almost 5000 years old. Egyptians used antimony sulphide in their cosmetics. The black color of mineral stibnite was used as Mascara or eyeliner.

Roman author Pliny

In the first A.D century, a roman author Pliny used the name stibium from which the element symbol came from. He described that metal was found in silver ores.

Vannoccio Biringuccio

In the 1500s, an Italian metallurgist Vannoccio Biringuccio described that antimony was about to be pure metal but stopped doing do because of early mining. Alchemists were successful in the production of elemental antimony.

Nicolas Lémery

In 1707, a French chemist Nicolas Lémery was the first who published his findings on antimony and its compounds.

Antimony-naming

Occurrence of Antimony

It is naturally found in the environment; rarely in free form but mostly exists in a combined state with other elements like silver, copper, lead, etc. The major antimony-containing ores are stibnite, jamesonite, and valentinite. It is also found in silver, copper, and nickel ores. the major producers of antimony are China, South Africa, Bolivia, and Russia.

Properties of Antimony

Antimony is classified as metalloid or semi-metal so it has two forms. The metallic form is silverish bright, brittle, and hard whereas the non-metallic form is greyish powder. The conductivities of antimony are less than metals. It is poor thermal and electrical conductor.

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In dry air, antimony remains stable and is not dissolved by acids and bases. The melting point of antimony is 630.63°C and its boiling point is 1587°C. It has a density of 6.685 grams per cubic centimeter. The element exists in solid phase at room temperature.

Biological Role of Antimony

There is no role of antimony in biological systems but it is considered to be very toxic. Antimony and its compounds are considered to be highly carcinogenic. Stibnite causes irritation to the eyes, lungs, and skin.

Long-term exposure to antimony and its compounds can cause severe lungs and heart problems, stomach and gut disorders, diarrhea, ulcers, or vomiting.

Uses of Antimony

Antimony-uses

  1. Black pigment from stibnite, especially in ancient times, was used as eyeliner or mascara.
  2. The pure antimony element is used in making infrared detectors and diodes.
  3. Antimony is used to make some semiconductors.
  4. To increase the strength of lead, antimony is alloyed with lead. It is also alloyed with other metals to increase strength and hardness.
  5. Alloys of antimony are used in cable sheathing and batteries.
  6. It is used in the manufacturing of paints, glazes, enamels, glass, and pottery.
  7. It is used in flame-retardant materials such as safety suits.
  8. It is used in the rubber and textile industry.

Isotopes of Antimony

There are almost 31 known isotopes of antimony whose mass number ranges from 104 to 136. There are two stable and naturally occurring isotopes which are Sb- 121 with 57. 36% abundance and Sb- 123 with 42. 64 % abundance.

MCQs

  • 1. What is the group number of antimony in the periodic table?
    • A) 14
    • B) 15
    • C) 16
    • D) 17
    • Answer: B) 15
  • 2. What is the atomic number of antimony?
    • A) 49
    • B) 51
    • C) 53
    • D) 55
    • Answer: B) 51
  • 3. How many neutrons are present in the nucleus of an antimony atom?
    • A) 51
    • B) 70
    • C) 121
    • D) 116
    • Answer: B) 70
  • 4. From which ancient civilization was the use of antimony in cosmetics documented?
    • A) Greek
    • B) Roman
    • C) Egyptian
    • D) Mesopotamian
    • Answer: C) Egyptian
  • 5. Who described antimony as being found in silver ores during the 1st century A.D.?
    • A) Plato
    • B) Socrates
    • C) Aristotle
    • D) Pliny
    • Answer: D) Pliny
  • 6. What was the name given to antimony by Roman author Pliny?
    • A) Antimonium
    • B) Stibium
    • C) Arsenicum
    • D) Plumbum
    • Answer: B) Stibium
  • 7. What was the occupation of Vannoccio Biringuccio, who described antimony in the 1500s?
    • A) Chemist
    • B) Philosopher
    • C) Metallurgist
    • D) Physician
    • Answer: C) Metallurgist
  • 8. In which form is antimony commonly found in the environment?
    • A) Free form
    • B) Combined form with gold
    • C) Combined form with lead
    • D) Combined form with silver
    • Answer: D) Combined form with silver
  • 9. What is the density of antimony?
    • A) 2.33 g/cm³
    • B) 6.685 g/cm³
    • C) 8.92 g/cm³
    • D) 10.49 g/cm³
    • Answer: B) 6.685 g/cm³
  • 10. Which of the following is a property of metallic antimony?
    • A) Brittle
    • B) Poor conductor of electricity
    • C) Greyish powder form
    • D) Bright silverish appearance
    • Answer: D) Bright silverish appearance
  • 11. What is the boiling point of antimony?
    • A) 630.63°C
    • B) 1587°C
    • C) 3033°C
    • D) 5012°C
    • Answer: B) 1587°C
  • 12. What is the primary use of antimony in ancient times?
    • A) Making jewelry
    • B) Eyeliner or mascara
    • C) Currency
    • D) Medicine
    • Answer: B) Eyeliner or mascara
  • 13. Which of the following is a biological role of antimony?
  • 14. How is antimony commonly used in the manufacturing industry?
    • A) Flavoring agent in food
    • B) Flame-retardant material
    • C) Solar panel production
    • D) Agricultural fertilizer
    • Answer: B) Flame-retardant material
  • 15. Which of the following is NOT a property of antimony?
    • A) Poor thermal conductor
    • B) Toxic to humans
    • C) Highly soluble in water
    • D) Exists in solid phase at room temperature
    • Answer: C) Highly soluble in water
  • 16. What is the most abundant stable isotope of antimony?
    • A) Sb-121
    • B) Sb-123
    • C) Sb-126
    • D) Sb-129
    • Answer: A) Sb-121
  • 17. What is the percentage abundance of Sb-123, the other stable isotope of antimony?
    • A) 57.36%
    • B) 42.64%
    • C) 73.9%
    • D) 26.1%
    • Answer: B) 42.64%
  • 18. What is the primary use of antimony in the rubber and textile industry?
    • A) Coloring agent
    • B) Flame-retardant
    • C) Strengthener
    • D) Preservative
    • Answer: B) Flame-retardant
  • 19. What is the foreign name for antimony, from which its symbol “Sb” is derived?
    • A) Arsenicum
    • B) Stibium
    • C) Natrium
    • D) Ferrium
    • Answer: B) Stibium
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Summary: Antimony Element

Antimony, a metalloid situated in group 15 and period 5 of the periodic table, is symbolized by “Sb” and has an atomic number of 51. Its rarity as a free element led to its name, derived from Greek words meaning “not alone.” Historically, it has been known since ancient times, with documented use in cosmetics and metallurgy. Notable figures like Pliny and Vannoccio Biringuccio contributed to its early understanding.

In its natural state, antimony is often found combined with other elements like silver and copper. Its properties vary between metallic and non-metallic forms, exhibiting brittleness and poor conductivity. While not biologically essential, antimony and its compounds are toxic, posing health risks upon exposure.

Despite its toxicity, antimony finds utility in various applications. It has been used historically in cosmetics, and modern applications include semiconductor manufacturing, alloying with lead for increased strength, and flame-retardant materials. Its isotopes, with stable forms like Sb-121 and Sb-123, contribute to its diverse applications.

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Overall, while antimony presents both historical intrigue and modern utility, its toxicity underscores the importance of handling it with care in industrial and scientific settings.