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Viri:

https://www.istockphoto.com/de/foto/atom-energie-hautnah-gm958936790-261849482

http://ekemija.osbos.si/e-gradivo/3-sklop/razvoj_teorije_o_zgradbi_atoma.html

https://www.istockphoto.com/vector/vector-three-dimensional-hand-drawn-chemical-yellow-symbol-of-sodium-or-natrium-gm1178606745-329494394

https://www.istockphoto.com/vector/vector-three-dimensional-hand-drawn-yellow-chemical-symbol-of-noble-gas-helium-with-gm1175502392-327364198

https://www.istockphoto.com/vector/vector-three-dimensional-hand-drawn-yellow-green-chemical-symbol-of-fluorine-with-gm1175514815-327374697

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