The letter A is used as an abbreviation for atom. ATM is used to mean atmosphere.
It is also possible that someone asked wrongly and wanted to know what ATOM means as an acronym. ATOM stands for many different things, including:
Wiki User
∙ 7y agoWiki User
∙ 13y agoIt is the chemical symbol of that element. One or two characters, the first always a capital:
C for carbon, He for helium, O for oxygen, N for nitrogen, S for sulfur
Na for sodium (from Latin: natrium), Ca for calcium, etc.
Wiki User
∙ 12y agoAbbreviations for elements are called chemical symbols.
Lab is the abbreviation for Laboratory.
The symbol for the Euro is: € The standard abbreviation is: EUR
The smallest atom is hydrogen.
Specific
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In chemistry the abbreviation amu stands for atomic mass unit. It is defined as 1/12th the mass of a carbon atom.
atom Be is the abbreviation for beryllium, a light strong brittle grey toxic bivalent metallic element having atomic number 4.
The noble gas abbreviation for carbon is [He] 2s^2 2p^2, which represents the electron configuration for a carbon atom. This notation indicates that carbon has two electrons in its 2s orbital and two electrons in its 2p orbital.
There are multiple numbers on the periodic table. The ones right under the abbreviations is the atomic weight of the atom. The number just above the abbreviation is the atomic number. Here is an example: Sodium 11= Atomic Number Na= Atom Abbreviation 22.99= Atomic weight
In chemistry, the abbreviation e- stands for an electron, which is a negatively charged subatomic particle that orbits the nucleus of an atom. Electrons are involved in various chemical reactions and determine the properties of different elements.
EN in the periodic table stands for Electronegativity. Electronegativity is a relative measure of an atom's ability to attract shared electrons to itself when it is chemically bonded with another atom.
The chemical symbol for carbon monoxide is CO.
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The formula for a single atom is its elemental symbol, which is a one or two-letter abbreviation representing the element (e.g., H for hydrogen, O for oxygen). Each element has a unique symbol that is used to represent it in chemical formulas and equations.
The abbreviation for abbreviation is "abbr."
The abbreviation for centimeter is cm. The abbreviation for meter is m. The abbreviation for inches is in. The abbreviation for liter is L.
The periodic table typically provides information on elements including atomic number, atomic weight, and symbol. The atomic number represents the number of protons in an atom's nucleus, while the atomic weight is the average mass of the atom. The symbol is a one- or two-letter abbreviation that represents the element.