JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Numerical Value Type Questions - Classification of Elements and Periodicity in Properties

How many pairs are there in the following options in which first species has lower ionisation energy than second species?

(i) N and O

(ii) Br and K

(iii) Be and B

(iv) \[I\text{ }and\text{ }{{I}^{}}\]

(iv) \[\,Li\text{ }and\,\,L{{i}^{+}}\]

(v) O and S

(vii) Ba and Sr

Answer:

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