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The Periodic Table is arranged based off of A) chemical properties of elements and B) Atomic numbers. When what im assuming your chemistry teacher says four families, he is referring to the four main families of the periodic table that are used in high school chemistry, these are A) Group 1 : The Alkali earth metals , which are all highly reactive metals B) Group 2 : The Alkaline earth metals C) Group 17 : The Halogens, these are all very stable substances which bond very well with the Alkali earth metals to form salts and D) Group 18 : The Noble gasses or Inert gasses , these are all highly stable gasses due to their full valency shell, they do not generally bond with other metals

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Q: What are the four families of a periodic table?
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