... elements. And, reactive metals, like Alkali metal family, can be chemically stable with some electrons within their family, but violently explosive with others in the group. The Father of the Periodic Table was a Russian chemistry professor named Dmitri Mendeleev. His original chart was unique in that it resembled a calendar. Down each column he listed similar properties and across he placed all of the elements that repeated properties. Upon completing his table, Mendeleev noticed there were missing spaces that could not be filled by any known element. Instead of thinking of them as defects, he let the blank spaces represented elements that had ... of valence electrons. Rows across the table is called "periods." The number of valence electrons increases from left to right as well. Comparing families of elements reveal which electrons are inactive and reactive. Noble gases, or "inert" gases are inactive. On the other hand, reactive nonmetals, like the Halogen family react easily with other elements. And, reactive metals, like Alkali metal family, can be chemically stable with some electrons within their family, but violently explosive with others in the group. The Father of the Periodic Table was a Russian chemistry professor named Dmitri Mendeleev. His original chart was unique in that it resembled a ...
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