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AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
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1 Jan 1910 Jahr - English chemist Frederick Soddy in 1910 observed that “elements of different atomic weights [now called atomic masses] may possess identical (chemical) properties

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6 Nov 2019
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Datum:

1 Jan 1910 Jahr
Jetzt
~ 115 years ago