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As of 2019, there are 118 known elements, about 80 of which are stable – that is, they do not change by radioactive decay into other elements. Some elements can occur as more than a single chemical substance . For instance, oxygen exists as both diatomic oxygen (O 2) and ozone (O 3). The majority of elements are classified as metals.
[16] [17] [18] A molecule may be homonuclear, that is, it consists of atoms of one chemical element, as with two atoms in the oxygen molecule (O 2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (two hydrogen atoms and one oxygen atom; H 2 O). A molecule is the smallest unit of a substance that ...
C 7 H 4 ClFO 2-chloro-6-fluorobenzaldehyde: 387-45-1 C 7 H 4 ClNO 2: chloroxazone: 95-25-0 C 7 H 4 CrO 3 S: thiophene chromium tricarbonyl: 12078-15-8 C 7 H 4 CrO 3 Se: selenophene chromium tricarbonyl: 12078-16-9 C 7 H 4 CrO 3 Te: tellurophene chromium tricarbonyl: 39015-36-6 C 7 H 4 MnNO 3: azacymantrene: 32761-36-7 C 7 H 4 O 3 S: tioxolone ...
The following are subcategories containing chemical compounds by element. An alternative listing of inorganic compounds may be found at inorganic compounds by element . Wikimedia Commons has media related to Chemical compounds by element .
Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
A science project is an educational activity for students involving experiments or construction of models in one of the science disciplines. Students may present their science project at a science fair, so they may also call it a science fair project. Science projects may be classified into four main types.
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
Pure water will tend to boil near 100 °C (212 °F), an example of one of the characteristic properties that define it. Other notable chemical substances include diamond (a form of the element carbon), table salt (NaCl; an ionic compound), and refined sugar (C 12 H 22 O 11; an organic compound).
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