Chemistry | Definition, Topics, Types, History, & Facts | Britannica
2 days ago · Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization. Today, vinyl, Teflon, liquid crystals, semiconductors, and …
List of chemical elements | Periodic Table, Atomic Number, Atomic …
A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.
Chemical synthesis | Organic & Inorganic Reactions | Britannica
Chemical compounds are made up of atoms of different elements, joined together by chemical bonds. A chemical synthesis usually involves the breaking of existing bonds and the formation of new ones.
Bromine | Properties, Uses, & Facts | Britannica
Bromine, chemical element, a deep red noxious liquid, and a member of the halogen elements, or Group 17 of the periodic table. Natural salt deposits and brines are the main sources of bromine and its …
Chemical element | Definition, Origins, Distribution, & Facts | Britannica
Jan 9, 2026 · A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is …
Periodic table | Definition, Elements, Names, Symbols, Groups, Charges ...
Dec 22, 2025 · Periodic table, in chemistry, is an organized array of all the chemical elements in order of increasing atomic number. When the elements are thus arranged, there is a recurring pattern in …
Chemical Definition & Meaning | Britannica Dictionary
CHEMICAL meaning: 1 : of or relating to chemistry; 2 : working by means of chemicals
Chemical reaction - Energy, Reactants, Products | Britannica
Jan 13, 2026 · Chemical reaction - Energy, Reactants, Products: Energy plays a key role in chemical processes. According to the modern view of chemical reactions, bonds between atoms in the …
Gold - Element, Precious Metal, Jewelry | Britannica
Jan 24, 2026 · Gold - Element, Precious Metal, Jewelry: Gold is one of the densest of all metals. It is a good conductor of heat and electricity. It is also soft and the most malleable and ductile of the …
Lead | Definition, Uses, Properties, & Facts | Britannica
Jan 22, 2026 · What is lead as a chemical element? What does lead look like and what is its symbol on the periodic table? Where is lead found in nature? What are some uses of lead in everyday life?