2025年9月27日 · A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which …

A chemical element is a basic substance. It cannot be broken down into simpler substances. Chemical elements are the building blocks for all matter—that is, everything that…

2025年9月18日 · 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 …

2025年9月13日 · Neon, chemical element, inert gas of Group 18 (noble gases) of the periodic table, used in electric signs and fluorescent lamps. Colorless, odorless, tasteless, and lighter …

6 天之前 · gold (Au), chemical element, a dense lustrous yellow precious metal of Group 11 (Ib), Period 6, of the periodic table of the elements. Gold has several qualities that have made it …

2025年9月1日 · Silver, chemical element of atomic number 47, a white lustrous metal valued for its decorative beauty and electrical conductivity. Silver’s physical and chemical properties are …

2025年8月13日 · Although hydrogen is the most abundant element in the universe (three times as abundant as helium, the next most widely occurring element), it makes up only about 0.14 …

2025年9月18日 · In 1813 British chemist Sir Humphry Davy, who was passing through Paris on his way to Italy, recognized substance X as an element analogous to chlorine; he suggested …

2025年9月21日 · Phosphorus, chemical element of the nitrogen group that is a soft waxy solid at room temperature.

2025年9月30日 · carbon (C), nonmetallic chemical element in Group 14 (IVa) of the periodic table. Although widely distributed in nature, carbon is not particularly plentiful—it makes up only …