Talk:Atom

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History[edit]

Is this video worth referencing in the article? I thought it might complement the history section section with the visuals http://ed.ted.com/lessons/the-2-400-year-search-for-the-atom-theresa-doud Jcardazzi (talk) 22:01, 4 April 2015 (UTC)jcardazzi

First evidence-based theory[edit]

For instance, there are two types of tin oxide: one is 88.1% tin and 11.9% oxygen and the other is 78.7% tin and 21.3% oxygen (tin(II) oxide and tin dioxide respectively). This means that 100g of tin will combine either with 13.5g or 27g of oxygen. 13.5 and 27 form a ratio of 1:2, a ratio of small whole numbers.

This explanation for 100g of tin confused me to expect the quantity of Oxygen to be 11.9g and 21.3g respectively for 11.9% and 21.3% Oxygen. It would be better if it was shown how the value was derived.

Quantity of Tin + Quantity of Oxygen = Quantity of Compound

Quantity of Compound = Quantity of Tin /  % of Tin in that compound * 100

For 100g of tin;
Quantity of tin(II) oxide = 100g ÷ 88.1 × 100
Quantity of tin(II) oxide = 113.50737797956867196367763904654 g


∴ Quantity of Oxygen = 113.5g - 100g
Quantity of Oxygen = 13.5g

Simillary we get
Quantity of tin dioxide = 127.06480304955527318932655654384 g
and Quantity of Oxygen = 127g - 100g
Quantity of Oxygen = 27g

Ajoe.blk (talk) 19:00, 18 April 2016 (UTC)

PM[edit]

Someone please define "pm" - picometres in the section about atom size, pm = 1 trillionth of a metre. This is not at all obvious to the average reader. Avoid unexplained tech abbreviations/jargon! — Preceding unsigned comment added by 122.151.160.219 (talk) 01:41, 25 November 2015 (UTC)

Theoretical[edit]

the first section is "history of atomic THEORY", yet nowhere in the opening paragraph does it mention that the atom is theoretical. — Preceding unsigned comment added by Lymphoid (talkcontribs) 02:29, 18 December 2015 (UTC)

Copy-edit queries[edit]

I've just changed a few minor things. Question: "Atoms are small enough that classical physics gives noticeably incorrect results." Results on what? Size? Mass? Tony (talk) 10:39, 6 February 2016 (UTC)

External links modified[edit]

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Brownian motion[edit]

Botanist Robert Brown looked observed pollen grains not dust grains.[1] — Preceding unsigned comment added by 41.45.221.97 (talk) 15:29, 3 May 2016 (UTC)

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Tin Dioxide naming[edit]

Under the heading "first evidence-based theory", there is a reference to tin(II) oxide and then a reference to tin dioxide. To comply with standard IUPAC naming conventions, tin dioxide should be shown as tin(IV) oxide. — Preceding unsigned comment added by Nick0927 (talkcontribs) 04:00, 31 October 2016 (UTC)

Create wiki links for "nuclear fission"[edit]

Nuclear fission is mentioned a few times in the article. We should create links to the nuclear fission wiki page. 174.117.121.225 (talk) 21:55, 21 January 2017 (UTC)

  1. ^ BBC Four - Atom, Episode 1: The Clash of the Titans, Jim Al-Khalili, 2007. DVD