8th Grade

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8th Grade Unit 2 Physical and Chemical
Properties Lesson 1 The Periodic
Table Vocabulary of Instruction
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1. Periodic Table

• Is a chart with all the chemical elements
  organized by increasing atomic number.

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2. Metals

• An element that easily gives up its valence
  electrons in a chemical reaction and that can be
  classified on its physical properties

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3. Nonmetals

• An element which is dull-colored, brittle and
  non-conductor of electricity or heat. It usually
  gain or share valence electrons in a chemical
  reaction.

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4. Metalloids

• An element which contain properties of both
  metals and nonmetals in terms of malleability,
  ductility, conductivity, and luster.

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5. Group
Group

• A set of elements comprising a vertical column of
  the periodic table. There are 18 groups in the
  Periodic Table.

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6. Period
Period

• A set of elements comprising a horizontal row of
  the periodic table. There are 7 periods in the
  Periodic Table.

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7. Family

• A group (vertical column) of elements with
  similar chemical properties.

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8. Shell / Energy Level

• Is the outside part of an atom around the atomic
  nucleus. In general, elements in the same group
  contain the same number of valence electrons and
  elements in the same period contain that number
  of shells.