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what does the atomic number mean

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Well at one point in time the Periodic Table wasn't around. How do you think the idea came to be? Was it a senile, old man and the idea just popped into his head? Was it a long process of research? Who first had the idea to come up with a way to classify all the elements? How do we know there aren't other elements we haven't discovered.

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How do you tell the difference between a compound an mixture.

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Which side of the periodic table is more reactive?

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What are Columns In the Periodic Table Called?

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The rows in the periodic table are groups.

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What are rows in the periodic table called?

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What is the difference between molecules & atoms.

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Why are elements on the periodic table labeled with letters?

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What year did the Periodic Table start and how did it start?

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Why do valence electrons cause elements to be stable and reactive? 

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Why do valence electrons cause elements to be stable and reactive? 

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What is the history of the periodic table and why was it made

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how do you discover elements?

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Why are the groups on the periodic table labeled with both #A and #B?

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Hydrogen is a nonmetal. Why is Hydrogen in the section on the Periodic Table of metals in stead of on the other side with the nonmetals?

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periodic table metals nonmetals metalloids - Bing images

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Periodic Table Families Periodic Table Groups Metal Nonmetal Metalloid Periodic Table with Names Colored Periodic Table Metals Nonmetals Metalloids Periodic Table of Elements Metals Nonmetals Metalloids Where Are the Metalloids On Periodic Table On the Periodic Table Metalloids Periodic Table of Elements Metalloids Where Are the Metals On the Periodic

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Potassium is a highly reactive element. What makes it so reactive?