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Chapter 20 Questions and Answers
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Chapter 20 Questions and Answers Group Mendeleev discovered that if he placed eight elements in each row and then continued on to the next row, the columns of the table would contain elements with similar properties. He called the columns groups. They are sometimes called families, because elemen...

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  • December 18, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • chapter 20 questions and answers
  • periodic table mendeleevs table of the elements i
  • period the term period refers to the interval betw

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Chapter 20 Questions and Answers
Group - answer Mendeleev discovered that if he placed eight elements in each row
and then continued on to the next row, the columns of the table would contain elements
with similar properties. He called the columns groups. They are sometimes called
families, because elements within a group are similar but not identical to one another,
like people in a family.

Periodic Table - answer Mendeleev's table of the elements is called a periodic table
because of its repeating pattern.

Period - answer The term period refers to the interval between repetitions. In a
periodic table, the periods are the rows of the table. In Mendeleev's table, each period
contains eight elements, and then the pattern repeats in the next row.

Metals - answer Metals are elements that are good conductors of electricity. They
are the largest of the three classes of elements.

Nonmetals - answer Nonmetals are elements that do not conduct electricity. They
are the second largest class of elements.

Metalloids - answer Metalloids have some properties of metals and some properties
of nonmetals.

Valence Electrons - answer The electrons in the outer energy level of an atom are
called valence electrons. It is valence electrons that are potentially involved in chemical
reactions. The number of valence electrons determines an element's reactivity, or how
likely the element is to react with other elements. The number of valence electrons also
determines whether the element can conduct electric current.

Alkali Metals - answer All the other elements in group 1 are alkali metals. They are
the most reactive of all metals, and along with the elements in group 17, the most
reactive elements. Because alkali metals are so reactive, they are only found in nature
combined with other elements. The alkali metals are soft. Most are soft enough to cut
with a knife.

Alkaline Earth Metals - answer The alkaline Earth metals include all the elements in
group 2. These metals have just two valence electrons, so they are very reactive,
although not quite as reactive as the alkali metals. In nature, they are always found
combined with other elements. Alkaline Earth metals are silvery grey in color. They are
harder and denser than the alkali metals. All are solids at room temperature.

Transition Metals - answer Groups 3-12 of the periodic table contain transition
metals. Transition metals have more valence electrons and are less reactive than

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