Antimony (Sb)
Antimony (Sb, element 51) is a metalloid in group 15, period 5. Atomic mass 121.76, electron configuration [Kr] 4d¹⁰ 5s² 5p³, uses and facts.
About Antimony
Antimony is a metalloid with the symbol Sb and atomic number 51. It is a solid at room temperature, and it sits in group 15, period 5 of the periodic table. Antimony has been known since antiquity.
Antimony key facts
- Atomic number: 51
- Symbol: Sb
- Atomic mass: 121.76 u
- Category: metalloid
- Group: 15
- Period: 5
- State at room temperature: solid
- Electron configuration: [Kr] 4d¹⁰ 5s² 5p³
- Electronegativity (Pauling): 2.05
- Melting point: 903.78 K (630.63 °C)
- Boiling point: 1860 K (1586.85 °C)
- Density: 6.697 g/cm³
- Common oxidation states: −3, 0, +3, +5
Electron configuration
The electron configuration of antimony is [Kr] 4d¹⁰ 5s² 5p³. The part in brackets is the noble gas core; the rest shows how the outer electrons fill their subshells. Antimony has 5 valence electrons.
Uses of antimony
- Flame retardants
- Alloys
- Semiconductors
Did you know?
Ancient Egyptians used antimony sulfide (kohl) as eye makeup. Still used in some eyeliner today.
Other elements in group 15 and neighbours
Frequently asked questions
What is the atomic number of antimony?
The atomic number of antimony is 51, which means every antimony atom has 51 protons.
What is the electron configuration of antimony?
The electron configuration of antimony is [Kr] 4d¹⁰ 5s² 5p³.
What group and period is antimony in?
Antimony is a metalloid in group 15, period 5.
What state is antimony at room temperature?
Antimony is a solid at room temperature.
What is antimony used for?
Antimony is used for flame retardants, alloys, semiconductors.