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05-10-2016
Chemistry

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THE PERIODIC TABLE

How reactive are the elements in Group 18? Explain this reactivity in terms of the number of valence electrons.

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08-10-2016

The noble gases are a group of chemical elements that make up Group 18 on the periodic table. These gases all have similar properties under standard conditions: they are all odorless, colorless, monatomic gases with very low chemical reactivity.

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