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Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!
Atomic Radius in the Periodic Table of Elements. The atomic radius of a chemical element is a measure of the size of its atom, usually, the distance from the center of the nucleus to the outermost isolated electron.
Explore how electronegativity changes with atomic number in the periodic table of elements via interactive plots.
Atomic Mass in the Periodic Table of Elements. Relative atomic mass is the ratio of the average mass of the atom to the unified atomic mass unit (symbol: u) or dalton (symbol: Da), which is defined as one twelfth of the mass of a carbon-12 atom in its ground state.
Oxygen is the third most abundant element in the universe and makes up nearly 21% of the earth's atmosphere. Oxygen accounts for nearly half of the mass of the earth's crust, two thirds of the mass of the human body and nine tenths of the mass of water.
Melting Point in the Periodic Table of Elements. The melting point is the temperature at which a substance changes state from solid to liquid at atmospheric pressure. When considered as the temperature of the reverse change (from liquid to solid), it is referred to as the freezing point.
Explore how density changes with atomic number in the periodic table of elements via interactive plots.
Periodic Table element Summary Boron. Boron is a chemical element with symbol B and atomic number 5. Classified as a metalloid, Boron is a solid at room temperature.
Copper is a chemical element with symbol Cu and atomic number 29. Classified as a transition metal, Copper is a solid at room temperature.
Tellurium is a chemical element with symbol Te and atomic number 52. Classified as a metalloid, Tellurium is a solid at room temperature.