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Question

With reference to long form of the periodic table fill in the blank spaces with appropriate words.

The seventh period is also ________ period, but is __________.


A

long

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B

incomplete

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Solution

The seventh period (horizontal) contains 32 elements like 6 th period.

  • Initially, this period consist of elements that were yet to be discovered. Also, it is called incomplete because the properties of these elements have not been studied properly yet and more information is required to understand these elements properly.

Long form of periodic Table: In the long form of the periodic table, elements are arranged in the order of their increasing atomic number in the tabular form.

  • It has 18 vertical groups or columns and 7 horizontal rows or series.
  • The long form of periodic table follows modern periodic law.

Therefore, the seventh period is also long period, but is incomplete.


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