Ch 6 Notes. The Periodic Table - elements are arranged in groups based on properties Dmitri...
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![Page 1: Ch 6 Notes. The Periodic Table - elements are arranged in groups based on properties Dmitri Mendeleev arranged the elements according to atomic mass and.](https://reader033.fdocuments.us/reader033/viewer/2022051621/5697bfd51a28abf838cad9b2/html5/thumbnails/1.jpg)
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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• 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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Antimony
Boron
Arsenic
Germanium
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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 elements
Group 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.