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Dmitri Ivanovich Mendeleev
Dmitri Ivanovich Mendeleev
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.
Our Abridged Periodic Table
Our Abridged Periodic Table
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.
There are 118 elements that make up everything. Around 90 can be found naturally on Earth. The other elements were created in the lab.
There are 118 elements that make up everything. Around 90 can be found naturally on Earth. The other elements were created in the lab.
Relative percentage of various elements that make up the human body
Fluorine
Fluorine
Fluorine can be found in column 7 of the periodic table. You will note that it has 7 outer electrons.
Atomic structure of Fluorine
Lithium
Lithium
Column 1; one outer electron
Sodium
Sodium
Column 1; one outer electron
Potassium
Potassium
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.
Beryllium
Beryllium
Column 2; Two outer electrons
Magnesium
Magnesium
Column 2; Two outer electrons
Calcium
Calcium
Column 2; Two outer electrons
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