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                                    Referenca• Lawrie Ryan, Roger Norris, Chemistry Course book, Cambridge University Press, 2014• Graham Hill, Andrew Hunt, Ocr Chemistry, Hodder Education, 2008, London, UK• Andrea Koates, Michelle Austin, Richard Grimmer, Science Progres 1, 2018.• Tom Speirs, Robert Vilson, N5 Chemistry Student Book, 2013, Glasgow, Scotland.• Andry Cooke, Jean Martin, Spectrum Chemistry, 2011.• Dr. Ivan Filipoviq & Dr. Stjepan Lipanoviq, Kimia e përgjithshme, Prishtinë, 1996.• Burimi i fotografive: https://www.dreamstime.com/ http://www.flickr.com/photos http://commons.wikimedia.org https://www.pinterest.com/search https://www.shutterstock.com/search/natural+science
                                
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