Re: ²²Na

Actually, this is not the conventional notion was is generally used
(or at least once was) in nuclear physics.

The traditional notation is to precede the elements sybol with its
atomic number, and follow it with its atomic weight. For Sodium 22, an
isotope, this would be (ignoring superscripting and subscripting type
fonts), 11Na22. 11 is the number of protons in the nucleus, and 22
its atomic weight (the total number of protons and neutrons). Ordinary
Sodium is 11NA22.98977 or 11Na23, or slang 23Na.To put the atomic
weight before the element name is essential slang or technical
shorthand popular among students, since to post the elements atomic
number before its symbol is a bit redundant.

For example, with Uranium:

92U238, or 92U235, which can be shortened to 238U and 235U., since
every student of science recognizes U is the unique element with the
atomic number of 92, and an element with 92 protons in its nucleus is,
by definition, Uranium. Only the isotopic masses of Uranium differ.

1H1 and 1H2 for example are both Hydrogen. 1H1 is conventionally
called Hydrogen, but 1H2 is generally referred to as Deuterium...an
isotope. Still, both are Hydrogen because they have the same number of
protons.

The classic notation that I am citing dates back to the Periodic Table
of the Elements, conceived by Dmitri Ivanovich Mendeleev (1834-1907),
who likely has no clue as to the meaning of atomic weight, but his
notation as augmented remains in use still today in most formal
scientific publications.

Harry C.








On May 16, 2:51 pm, Srinidhi Venkatesh <srinidhiv...@xxxxxxxxx> wrote:
What is ²²Na ? What does it mean when the 22 comes as a superscript
before Sodium? Could you please explain it to me? I have a rough idea,
but my friend has no clue


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