Periodic Table as Arranged by Mendelejeff attention ... Kr 82.92 (38) Cu 63.67 (S9) Zn, 68.37 (SO,) Ga 69.9 (81) Ge 72.8 (82) As 74.96 (88) Se 79.2 (S4) Br 79.92 (35) Rb 86.4 8 (37) Sr 87.63 ...
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On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.
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The elements that lie between group 2 and group 13 are often referred to as the d-block elements. In this topic, we will concern ourselves with the elements of the third period: scandium to zinc. The ...