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Definition of Atomic number 2
1. Noun. A very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas).
Generic synonyms: Chemical Element, Element, Argonon, Inert Gas, Noble Gas
Lexicographical Neighbors of Atomic Number 2
Literary usage of Atomic number 2
Below you will find example usage of this term as found in modern and/or classical literature:
1. Science by American Association for the Advancement of Science (1917)
"It is true that between helium, atomic number 2 and sodium, atomic number 11, we
have no evidence other than the order of atomic weights, the progression of ..."
2. The Electron: Its Isolation and Measurement and the Determination of Some of by Robert Andrews Millikan (1917)
"... of atomic number 2, since its nucleus has but two free positive charges, while
its atomic weight is 4, we may imagine that its nucleus is actually made ..."
3. Smith's Intermediate Chemistry by Alexander Smith (1922)
"The helium atom (atomic number = 2) has two electrons, which are supposed to be
situated on opposite sides of the nucleus — a very stable arrangement. ..."
4. Outlines of Theoretical Chemistry by Frederick Hutton Getman (1918)
"... the second series of elements are as follows: — Group number 01234567 Maximum
valence ...0 1 2 3 4 5 6 7 Element He Li Be BCN 0 F atomic number 2 3 4 5 ..."
5. Organic Chemistry for Advanced Students by Julius Berend Cohen (1918)
"... negative charge of the electrons attached to the central nucleus is probably
represented by the atomic number,2 which, with the exception of hydrogen, ..."
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