Diagonal relationship is shown by

Options :
  1. elements of first period
  2. elements of second period
  3. both 1 and 2
  4. elements of third period
Answer and Explanation :-

Answer: Option 3


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Of two hearts one is always warm and one is always cold: the cold heart is more precious than diamonds: the warm heart has no value and is thrown away.
-Graham Greene The Heart of the Matter