Talk:Atom

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Atom is a former featured article. Please see the links under Article milestones below for its original nomination page (for older articles, check the nomination archive) and why it was removed.

This article appeared on Wikipedia's Main Page as Today's featured article on July 9, 2008.

Article milestones
Date	Process	Result
October 17, 2007	Peer review	Not reviewed
February 9, 2008	Peer review	Reviewed
February 10, 2008	Good article nominee	Listed
February 18, 2008	Featured article candidate	Promoted
October 25, 2020	Featured article review	Demoted
This article was on the Article Collaboration and Improvement Drive for the week of November 21, 2007.
Current status: Former featured article

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Error re fraction of atom's mass in the nucleus

Latest comment: 1 year ago2 comments1 person in discussion

"More than 99.9994% of an atom's mass is in the nucleus" in paragraph 3 of the current article is simply WRONG (despite the reference!) -- protons weigh ~1836 times more than electrons, neutrons weigh ~1838 more, so the ratio (for neutral atoms, with their varying binding-mass-energy and varying neutron-proton-ratios in different atoms and their isotopes) is between about 99.98% and 99.94% -- significantly different than what the reference said -- perhaps the person who wrote (or edited or typeset) that reference mistakenly threw in a few extra nines? ^z (talk) 11:54, 12 June 2025 (UTC)Reply

... confirmed "more than 99.94%" via calculations, and found reference in ELECTRON THEORY, Vennie Edwards (2018), first paragraph of Chapter 3 ("Atoms") ... have corrected the "Atom" article page appropriately ... ^z (talk) 16:28, 13 June 2025 (UTC)Reply

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Talk:Atom

Error re fraction of atom's mass in the nucleus