Two elements with symbol X (atomic no. 16) and Y (atomic no. 12) are placed in the III period of the Modern Periodic Table

CBSE Class 10 CBSE Class 10 Science
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Two elements with symbol X (atomic no. 16) and Y (atomic no. 12) are placed in the III period of the Modern Periodic Table.

  1. Which amongst the two has more metallic character?
  2. Calculate the valency of each element.
  3. Element ‘Y’ is smaller than ‘X’ in terms of atomic size. Is the statement true, justify?

Answer:

  1. Y
  2. 2 each
  3. False, same period but Y lies in group 2 and X in group 16. So, as we move from left to right size decreases with increase in nuclear charge.