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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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Metals are found left of the “staircase” on the Periodic Table and at the bottom, nonmetals are  above it and at the top, and metalloids border it.

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Periodic table law is the principal that certain properties of the elements ocurr periodically when arranged by atomic number.

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with publishers deadline looming mendeleye didnt have time to describe all 63 then known elements . so he turned to a data set of atomic weights meticulousy gathered by others

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Ionization energy increases as you go up and to the right on the Periodic Table

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it gives me the elements, ans how many protons it has

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i know that it shows the mass numers & the groups and periods . 

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i know that it shows the mass numers & the groups and periods . 

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Jackiee

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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 itselectron 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 periodic table law states that the properties of elements are periodic functions of their atomic numbers.

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I know that there are elements with neutrons, eletrons & protons, arranged by atomic number they have. (;

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(Group 18) are unreactive and stable due to the fact that their valence level

of electrons is completely filled.

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fond of card games , he wrote the weight for each element on a seperate index card

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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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The most recent periodic table was approved february 19 2010

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The rows are called PERIODS and the columns are called GROUPS. Hydrogen (H) is the first element in the periodic table because it has just one proton in its nucleus. Helium (He) is second, because it has two protons, and so on. The periodic table can be coloured coded.Technetium was the first element to be made artificially

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The table has served chemistry students since 1869.

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Electronegativity increases as you go up and to the right on the Periodic Table.

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Mendeleyev didn’t have time to describe all 63 then-known elements. So he turned to a data set of atomic weights meticulously gathered by others.

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the periodic table has elements and arranged by atomic number

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In 1902 he acknowledged he had not anticipated the existence of these overlooked, incredibly unreactive elements—the noble gases—which now constitute the entire eighth group of the table.