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Dmitri Ivanovich Mendeleev
Dmitri Ivanovich Mendeleev (born 1834) was a Russian chemist. He was the main creator of the periodic table of elements. He published his periodic table of elements in the year 1869.
Many of the predictions made in his periodic table (such as the properties of elements undiscovered at the time) were later proved correct by experiments.
Chemical element 101 was named Mendelevium.
The column # of the periodic table tells you the number of electrons in the outer ring of the atoms in that column. Outer electrons are called "valence electrons."
The last column (#8) holds the inert or noble gasses. Noble gasses won't react because their rings (shells) are full.
The column number matches the number of electrons in the outer shell of an element.
Relative percentage of various elements that make up the human body
Fluorine can be found in column 7 of the periodic table. You will note that it has 7 outer electrons.
Atomic structure of Fluorine
Column 1; one outer electron
Column 1; one outer electron
Column 1; one outer electron
Lithium, Sodium, and Potassium each have 1 outer electron and therefore, they have similar properties. For example, they are soft metals and they corrode easily in air. Their position in the left-hand column indicates that they each have one outer electron in their outer shell.
Column 2; Two outer electrons
Column 2; Two outer electrons
Column 2; Two outer electrons