Argon (Ar), atomic number 18, is an inert noble gas used in welding, lighting and controlled atmospheres. Learn its properties, uses, isotopes and history....
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5 Minutes
5 Minutes
Chlorine (Cl): Atomic Number 17, Properties, Uses, Compounds and Safety
Chlorine (Cl), atomic number 17, is a reactive halogen gas. Learn its properties, compounds, water-disinfection uses, isotopes, biological role and safety....
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5 Minutes
Sulfur (S): Atomic Number 16, Properties, Uses, Compounds and Isotopes
Sulfur (S), atomic number 16, is a yellow group 16 nonmetal essential to life and industry. Learn its properties, compounds, uses, isotopes and safety....
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5 Minutes
Phosphorus (P): Atomic Number 15, Allotropes, Uses, Compounds and Isotopes
Phosphorus (P), atomic number 15, is a reactive group 15 nonmetal essential to DNA, ATP and bones. Learn its allotropes, properties, compounds, uses and isotopes....
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6 Minutes
Silicon (Si): Atomic Number 14, Properties, Uses, Compounds and Isotopes
Silicon (Si), atomic number 14, is a group 14 metalloid and semiconductor. Learn its properties, compounds, uses, isotopes, history and safety....
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7 Minutes
Aluminium (Al): Atomic Number 13, Properties, Uses, Compounds and Isotopes
Aluminium (Al), atomic number 13, is a lightweight group 13 metal. Learn its properties, electron configuration, compounds, uses, isotopes and history....
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6 Minutes
Boron is the chemical element with atomic number 5, symbol B
Boron is the chemical element with atomic number 5, symbol B Boron is the head of group 13 of the periodic table. Along with lithium and beryllium, it is one of the few light...
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14 Minutes
Carbon is the chemical element with atomic number 6 and symbol C
Carbon is the chemical element with atomic number 6 and symbol C Carbon has several types of allotropes, the most famous of which are graphite, diamond, and amorphous carbon. The physical properties of carbon...
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3 Minutes
Nitrogen is the chemical element with atomic number 7, symbol N (from Latin nitrogenium)
Nitrogen: Properties, Uses, and Environmental Impact Nitrogen is a chemical element with the atomic number 7 and the symbol N, derived from the Latin word nitrogenium. It is a colorless, odorless, tasteless gas that...
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6 Minutes
Barium is the chemical element with atomic number 56, symbol Ba
Barium is the chemical element with atomic number 56, symbol Ba Barium oxide was discovered in 1774 by Carl Wilhelm Scheele in manganese dioxide ores. It was isolated in 1808 by the Englishman Sir...
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8 Minutes
Radium is the chemical element with atomic number 88, symbol Ra
Radium is the chemical element with atomic number 88, symbol Ra Radium is perfectly white in appearance but darkens when exposed to the open air. Radium is an alkaline earth metal found in very...
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4 Minutes
Francium is a chemical element with the symbol Fr and atomic number 87
Francium is a chemical element with the symbol Fr and atomic number 87 Francium, known for a time as eka-cesium and actinium K, is the chemical element with atomic number 87, symbol Fr. It...
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9 Minutes
Beryllium is a chemical element with the symbol Be and atomic number 4
Beryllium is a chemical element with the symbol Be and atomic number 4 In the periodic table, Beryllium the first representative of the alkaline earth metals. The name beryllium comes from the Greek βήρυλλος...
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5 Minutes
Caesium is the chemical element with atomic number 55, symbol Cs
Caesium is the chemical element with atomic number 55, symbol Cs Under standard conditions, the single caesium or cesium body is a soft, ductile metal, white or silver to gold. Its melting point 28.5...
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5 Minutes
Helium is the chemical element with atomic number 2, symbol He
Helium is the chemical element with atomic number 2, symbol He Helium it is a noble gas (or rare gas), practically inert, the first of the noble gas family in the periodic table of...
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4 Minutes
Rubidium is the chemical element with atomic number 37, symbol Rb
Rubidium is the chemical element with atomic number 37, symbol Rb Rubidium is an alkali metal, soft and silvery, with a melting point of only 39.3 °C (102.74 °F). It can be kept liquid...
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5 Minutes
Potassium is the chemical element with atomic number 19, symbol K (from the Latin kalium)
Potassium is the chemical element with atomic number 19, symbol K (from the Latin kalium) Potassium is a soft, metallic-white, slightly bluish alkali metal that is naturally found bound to other elements in seawater...
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10 Minutes
Sodium (Natrium) is the chemical element with atomic number 11, symbol Na
Sodium is the chemical element with atomic number 11, symbol Na (from Latin natrium) The simple body sodium is a soft metal, silvery in color and very reactive, which is one of the alkali...
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