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Technetium was the first element to be made

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Dmitri mendeleev created the modern periodic table

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finding the protons is by looking at the top of the element # an will show you the protons

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Although you might expect 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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they numbers on top of the are the atomic number,and the mass is under the symbol 

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they numbers on top of the are the atomic number,and the mass is under the symbol 

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Dmitri Mendeleev Is the man who invented the periodic table.The rows are called PERIODS and the columns are called GROUPS. The elements are arranged in order of their atomic numbers.

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we sort elements by their number of protons, or “atomic number,” which determines an atom’s configuration of oppositely charged electrons and hence its chemical properties.

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Non metals are located on the right side from boron to helium down of the periodic table and metals are located left zinc to

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the periodic table has 18 groups and 7 periods and is divided by metals and nonmetals

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You can find the atomic mass and the symbol of a element. They are organized by the atomic number. they are in rows so other elements with similar structures are in the same vertical columns.

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metals and non metal are located on the table

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they know how use the periodic table to holds all elements  and a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.

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I learned that the end columns of the periodic table are known as the noble gases. they were long believed to totally unreactive but compounds of xenon.

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There are 90 elements on the periodic table that occur in nature. All of the other elements are strictly man-made.

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it holds all elements that have strong charges, there is all types of other groups like noble gases,halogens,alkali earth metals atomic numbers on the left side are lower than all atomic numbers on the right side. The periodic table shows information about each chemical elements

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

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the periodic table states the properties of elements  are functions of the atomic number
the periods are horizontal and the groups are vertical columns

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The periodic table is an arrangement of chemical elements with some similar chemical properties.

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i know that we can find the proton and find the atomic mass and find electron figuration . and other elements that have similar things in common .