According to Mendeleev’s ′ Periodic Law, the elements were arranged in the periodic table in the order of (a) increasing atomic number (b) decreasing atomic number (c) increasing atomic masses (d) decreasing atomic masses

Answer: (c) increasing atomic masses

Mendeleev’s periodic table

Mendeleev’s periodic table is an arrangement of elements in an increasing atomic mass order in a tablet form, such that it reflects similarities and trends in the behaviour of elements. Mendeleev’s periodic table can be understood better by reversing the arrangement of the elements.

  • Here elements are, arranged in an increasing order atomic mass, in a horizontal line.
  • This horizontal arrangement of elements is a ‘period’.
  • When an element has high similarity to an earlier element, the new element is, placed just below the earlier element having similar properties to start a new period.
  • The period’s one below the other form a ‘column’ (group). Thus, Mendeleev’s periodic table consists of horizontal rows and vertical columns or periods and groups, respectively.
  • If the element is similar but not very much, it is, placed below but slightly away to differentiate it. Each column will have two sub-columns (A and B) such that elements in the same sub-columns show more resemblance.

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