Atomic number of three elements P, Q and R are 20, 38 and 56 elements respectively. Which option is correct?

Atomic number of three elements P, Q and R are 20, 38 and 56 elements

1.	Atomic number of three elements P, Q and R are 20, 38 and 56 elements respectively. Which option is correct?
Answer» Its IONISATION ENTHALPY is INCREASING ORDER Q has maximum ionisation enthalpy R has maximum ionisation enthalpy Ionisation enthalpy of Q is in middlebetween P and R. Answer :d