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, …

As we mark the 150th anniversary of the periodic table, the scientific community has declared 2019 to be “The International Year of the Periodic Table”. PubChem is celebrating by …

PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and …

PERIODIC TABLE OF ELEMENTS Chemical Group Block 17 Atomic Number Cl Symbol Chlorine Name Halogen Chemical Group Block 1 H Hydrogen Nonmetal 1 1 2 He Helium Noble Gas 18 …

Explore how atomic mass changes with atomic number in the periodic table of elements via interactive plots.

Periodic Table element Summary Copper. Copper is a chemical element with symbol Cu and atomic number 29. Classified as a transition metal, Copper is a solid at 25°C (room temperature).

PERIODIC TABLE OF ELEMENTS Electronegativity 17 Atomic Number Cl Symbol Chlorine Name 3.16 Electronegativity (Pauling Scale) 1 H Hydrogen 2.2 1 1 2 He Helium 18 3 Li …

PERIODIC TABLE OF ELEMENTS Electron Configuration 17 Atomic Number Cl Symbol Chlorine Name [Ne]3s 2 3p 5 Electron Configuration 1 H Hydrogen 1s 1 1 1 2 He Helium 1s …

Explore how atomic radius changes with atomic number in the periodic table of elements via interactive plots.

Periodic Table element Summary Sulfur. Sulfur is a chemical element with symbol S and atomic number 16. Classified as a nonmetal, Sulfur is a solid at 25°C (room temperature).