What is the isotopic symbol for 18 protons and 23 neutrons?

1 Answer
anor277
Nov 2, 2016

This is the #""^41Ar# isotope.

Explanation:

This is [not a common argon isotope.](https://en.wikipedia.org/wiki/Isotopes_of_argon) The fact that there are 18 protons, i.e. 18 positively charged, massive nuclear particles, immediately specifies the argon element, and thus I don't have to write #Z#, #"the atomic number"#. There are #"23 neutrons"# contained in this nuclide to give a mass of #41*"amu"#

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