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There are 7

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On the bottom of the periodic table there is a two row block of elements that contain the lanthanoids and actinides

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Dmitri mendwleev was the founder of the periodic table

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Similar chemical properties to other elements in the same column - in other words similar chemical reactions. thats called periodic law

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There is 118 elements on the periodic table

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Atomic number is the number of protons each atom has in its nucleus

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The element symbol is one, two or three letters chosen to represent an element

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Similar chemical properties to other elements in the same column - in other words similar chemical reactions. thats called periodic law

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atoms of an element to get larger as their atomic number increases this does not always occur because the size of an atom is determined by the diameter of its electron shell. In fact, element atoms usually decrease in size as you move from left to right across a row or period.

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the right side are non metals , left side are metals and the metalloids are the stair steps on the right.

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1.hydrogen is the first element in the table because it has 1 proton
2. mass number-atomic number equals neutrons

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it is the way of organizing elements by number of atoms

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there 18 numbered groups in a periodic table

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90 of the elements occur in everyday nature. (:

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technetium was the first element to be made artificially.

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The country Argentina is named after the element silver and the only letter not in the periodic table is J

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how the element is put in it common group like gas, metals and liquid

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Dimitri Mendeleev discovered the periodic table.

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the left side are metals
helium is second because it has two protons

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The different rows of elements are called periods.
The Periodic Table of the Elements arranges all of the known elements in an informative array.
The number of protons in an atom defines what element it is

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Dmitri Mendeleev made the first periodic table. It arranges all the known elements informative array.