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The genius of Mendeleev's work was that it included dashes as placeholders for undiscovered elements.

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The genius of Mendeleev's work was that it included dashes as placeholders for undiscovered elements.

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Was that it included dashes as placeholders for undiscovered elements

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kept dash as placeholders for undiscovered elements.

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 was that it included dashes as placeholders for undiscovere elements.

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 was that it included dashes as placeholders for undiscovere elements.

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it was to leave DASHES for undiscovered elements 

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it was to leave DASHES for undiscovered elements 

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It included dashes as placeholders for undiscovered elements.

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Dobereiner?

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Johan Dobereiner

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Johann Dobereiner

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Johann Döbereiner

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Johan Dobereiner.

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Color, an animal

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Color and animal

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Color and Animal

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by color and animal

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color and animal

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Color and type

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Color and by animal

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The color, and the animals.

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increasing atomic number

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It is increasing the atomic numbers

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atomic number

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increasing atomic number.

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its arranged in order of increasing atomic number 

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its arranged in order of increasing atomic number 

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increasing atomic number

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[Try again - edit this post for full credit & I'll update your grade - PUPELLO]

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[Try again - edit this post for full credit & I'll update your grade - PUPELLO]

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Dmitri Mendeleev

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Henry Moseley

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henry mosley

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Henry Moseley

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Henry Moseley

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Henry Moseley created the modern PT.

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1

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1

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The "s" sublevel contains only 1 orbital

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one

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one orbital.

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1

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1 orbital

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14

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14

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14

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Up to 14 electrons fit into the f sublevel

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14

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14 electrons

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14 +1

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5 orbitals

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The "d" sublevel has 5 orbitals

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5 orbitals

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5

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The d sublevel contain 5 orbitals.

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Holds two electrons.

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2

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2