Isotopes

• 1910 Soddy establishes the existence of nuclides with the same number of protons but different number of neutrons.
• 1913 Decouvertes des isotopes *http://dbhs.wvusd.k12.ca.us/webdocs/Chem-History/Fajans-Isotope.html
• http://web.lemoyne.edu/~GIUNTA/richards.html
• http://web.lemoyne.edu/~GIUNTA/soddy.htmlItrodction du mot Isotope
• http://web.lemoyne.edu/~GIUNTA/urey.html Isotope Hydrogen

1927 stable isotope

• 1940 500 isotopes http://ie.lbl.gov/systematics/isodiscovery.pdf

Isotope

fer	54	5.81
fer	56	91.72
fer	57	2,21
fer	58	0.281
Zn	64	48.63
Zn	66	27.92
Zn	68	18.84
Cu	63	69.17
Cu	65	30.83
Ag	107	51.84
Ag	109	48.16