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SSC CGL 2021 PYQ — Question 45

SSC CGL - 23 Aug 2021 - Shift 2 • General Awareness • Q45

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The horizontal rows in the modern periodic table are called:

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Correct answer: A

Explanation

The correct answer is option 1 i.e. periods

The periodic table was created by Dmitri Mendeleev. Mendeleev’s periodic table has 63 elements. They were placed in a tabular form in increasing order of their relative atomic masses. There were certain limitations to Mendeleev’s periodic table which lead to the modern periodic table.

  • The horizontal rows in the periodic table are called 'Period'. There are 7 rows.
  • The vertical columns in the periodic table are called 'Groups'. There are 18 groups.