Starter 9/19-20/2013
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Starter 9/19-20/2013. Complete the chart using APE-MAN. Periods. Practice. Each row is called a “period”. The elements in each period have the same number of shells. 1 st Period = 1 Shell. 2 nd Period = 2 Shells. 3 rd Period = 3 Shells. 4 th Period = 4 Shells. www.chem4kids.com. - PowerPoint PPT Presentation
Transcript of Starter 9/19-20/2013
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Complete the chart using APE-MAN
ElementHydrogenBoronOxygenSodiumCalciumAtomic NumberProtonsElectronsAtomicMass Atomic NumberNeutrons
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Each row is called a periodThe elements in each period have the same number of shellswww.chem4kids.com Practice
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Each column is called a groupEach element in a group has the same number of electrons in their outer orbital, also known as shells.Except for He, it has 2 electronsThe electrons in the outer shell are called valence electronswww.chem4kids.com
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Transition Metals have slightly different rules for shells and valence electrons.This is something you will learn about in High School Chemistry.www.chem4kids.com
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www.chem4kids.com
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www.chem4kids.com
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Helium is the exception in Group 8.
Since it has just one shell, that shell can only fit 2 electrons instead of 8.
It is in this group because all the elements have a full outer shell.
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Leave space in your journal to complete the Bohr diagram/valence electron activityApplication
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