What is the purpose of the periodic table? A chart that: o Shows all known elements in the universe. o Organizes the elements by chemical properties.

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Presentation transcript:

What is the purpose of the periodic table?

A chart that: o Shows all known elements in the universe. o Organizes the elements by chemical properties.

 An element is a substance that contains only one kind of atom.  Elements in the periodic table are organized by the way they behave.  The elements are arranged in order of increasing atomic number

o # of protons found in the nucleus of an atom

o abbreviation of the element name.

o # of protons and neutrons in the nucleus of an atom.

 The modern periodic table is organized by increasing atomic number.  It is organized by the similarity in properties of the elements.

I made the PERIODIC TABLE !

 A Russian Chemist  In 1869 he published a table of the elements organized by increasing atomic mass which displayed repeating chemical characteristics.

Mendeleev’s table as published in 1869, with many gaps and uncertainties.

Mendeleev left vacant spaces where unknown elements should fit.

Stated that if the atomic weight of an element caused it to be placed in the wrong group, then the weight must be wrong! He even corrected the atomic masses of Be, In, and U

 Was so confident in his table that he used it to predict the physical properties of three elements that were yet unknown  Was so confident in his table that he used it to predict the physical properties of three elements that were yet unknown!

 After the discovery of these unknown elements between 1874 and 1885, and the fact that Mendeleev’s predictions for Sc, Ga, and Ge were amazingly close to the actual values, his table was generally accepted.

 During the nineteenth century, chemists began to put the elements into groups according to similarities in their physical and chemical properties. The end result of these studies was our modern periodic table.  on/physics/developing-periodic- table.html on/physics/developing-periodic- table.html

 The rows on the periodic table.  There are 7 periods on the periodic table.  Periods have consistent trends across them ex: atomic radius decreases from left to right

 The columns on the periodic table  There are 18 groups/families  They are given a number and letter to distinguish them  Most columns also have a family name  Example: The red column is group 1A or the alkali family

 shows/greatest-discoveries/videos/100- greatest-discoveries-shorts-periodic- table.htm shows/greatest-discoveries/videos/100- greatest-discoveries-shorts-periodic- table.htm

What a gloriously handsome beard.

What is the purpose of the periodic table?