Multiple choice

In the same period or group, there is a gradation in a particular property because

  1. there is a gradual increase in the number of shells across a period

  2. there is a gradual change in the electronic configuration of the elements

  3. there is a gradual increase in the number of valence electrons down the group

  4. there is a gradual increase in the atomic weights of the elements

  5. there is a gradual increase in their atomic size

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B Correct answer
Explanation

In the modern periodic table, the elements are arranged in the increasing order of their atomic numbers. The number of electrons in an atom are equal to its atomic number. Hence, there is a gradual change in their electronic configuration.

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