Ch 6 Notes

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Ch 6 Notes
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The Periodic Table -

• elements are arranged in groups based on
  properties
• Dmitri Mendeleev arranged the elements according
  to atomic mass and used the arrangements to
  predict the properties of missing elements.

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• The modern periodic table is arranged in order of
  increasing atomic number.
• The atomic number is the total number of protons
  in the nucleus.

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• The electron mostly determines the properties of
  an element.

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(No Transcript)
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• Indium ______ protons ______ electrons
  
• 49 49

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• Groups -
• Vertical
• Columns

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• Periods Horizontal Rows

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• Magnesium is in the same group as calcium.

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Magnesium is in the same period as phosphorus.
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Three classes of elements are metals, nonmetals,
and metalloids.
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• Metals include the majority of the elements.

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Pt is a metal. Si is a metalloid. Kr is a
nonmetal.
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Metals are shiny, malleable (hammered into
sheets), ductile (drawn into wires), solid at
room temperature, and good conductors of
electricity.
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Nonmetals are poor conductors of electricity,
often gases at room temperature, and brittle if
solid.
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Metalloids have some properties of metals and
nonmetals.
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Arsenic
Antimony
Germanium
Boron
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Group 1A - alkali metals
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Group 2A - alkaline earth metals
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Group 7A - halogens
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Group 8A - noble gases
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Groups 1A through 7A - representative
elementsGroup B - transition metals
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Aluminum is a representative element.Copper is a
transition metal.
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Na is an _______________________

• alkali metal

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Mg is an _______________________

• alkaline earth metal

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F is a ________________________

• halogen

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Ne is a ______________________

• noble gas

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Ag is a ______________________

• transition metal

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There are 5 electrons in the valence level of an
element in Group 5A.
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N, P, As, and Sb have the same number of
electrons in their valence levels.
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The electron configuration for an element in the
halogen group should always end with ns2np5. The
electron configuration of the element chlorine
ends in 3s23p5.
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Noble gases (inert gases) have their highest
occupied s and p sublevels filled.
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Fe contains an electron in a d sublevel.