The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis

CBSE Class 10 CBSE Class 10 Science
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The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis.
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  1. Write the electronic configuration of Ca.
  2. Predict the number of valence electrons in Rb.
  3. What is the number of shells in Sr?
  4. Predict whether K is a metal or a non-metal.
  5. Which one of these elements has the largest atom in size?
  6. Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.

Answer:

  1. Electronic configuration of Ca — 2, 8, 8, 2
  2. Valence electrons in Rb is 1.
  3. Five
  4. Metal
  5. Rb is biggest in size.
  6. Be < Mg < Ca < Rb