Dmitri Mendeleev

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Dmitri Mendeleev

• He organized the elements by atomic mass.

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metals

• Good conductors
• shiny

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properties

• These are periodic in the periodic table

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metals

• This class of elements are to the left of the
  zig-zag line.

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period

• A horizontal row in the periodic table

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Henry Moseley

• He organized the elements by atomic number.

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metalloids

• This class of elements on the zig-zag line.

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group

• A vertical column in the periodic table

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metalloids

• Semiconductors
• shiny

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nonmetals

• This class of elements are to the right of the
  zig-zag line.

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family

• Another name for a chemical group

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nonmetals

• poor conductors
• dull