August 10, 2020, 06:56:42 AM
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Topic: Atomic number top or bottom  (Read 239 times)

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Offline portiagriffey

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Atomic number top or bottom
« on: July 08, 2020, 03:46:57 PM »
Very simple question - I need to sit an equivalency exam and have never studies chemistry !!  First lesson my books, and asking the internet all puts the atomic number on top and the mass number underneath the symbol. But BBC bitesize chemistry and Oak National online year 9 lessons does it the other way around - what is the UK standard form? Thank you.

Offline Borek

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Re: Atomic number top or bottom
« Reply #1 on: July 08, 2020, 04:17:51 PM »
As far as I am aware there is no such thing as a "standard UK form", there is a standard notation defined by IUPAC in the Green Book (https://iupac.org/what-we-do/books/greenbook/), and it calls for the atomic number at the bottom.
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Offline jeffmoonchop

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Re: Atomic number top or bottom
« Reply #2 on: July 08, 2020, 06:06:14 PM »
Its the smaller number

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