Classes of Elements Properties

​Unit 2: periodic Table

Categories & properties​

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• Group 1 elements

• ​Have 1 valence electron

• ​Lose 1 electron to form +1 ions

• Extremely reactive

• Most reactive metal is Fr​

Alkali Metals

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• Group 2 elements

• Have 2 valence electrons

• Lose 2 electrons = +2 ion​

• Fairly reactive (not as much as group 1)​

​Alkaline Earth Metals

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Multiple Choice

What type of ion does Magnesium (Mg) normally form?

• +1

• +2

• -1

• -2

• Groups 3 - 12

• Form ​COLORED IONS in solution

• ​Where we find precious metals (ex. Gold, Silver)

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Transition Metals

• Group 17 elements

• Have 7 valence electrons ​

• Gain 1 elec​tron to form a -1 ion

• Very reactive​

• Most reactive nonmetal is F

Halogens

• Unreactive (inert)

• Stable octet - 8 valence electrons (except He)

• Always monoatomic (exist as 1 atom - not found as a compound)

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Noble Gases

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Multiple Choice

What is the most reactive nonmetal?

• Li

• Na

• F

• Br

• Not officially part of one group

• Nonmetal

• Gas at STP

  • STP: Standard Temperature & Pressure ​

  • STP = 0 Celsius, 1 atm

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Hydrogen

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