The successive ionisation energy values for an element ‘X’ are given below XV. Ist ionisation energy =410 kJ ${\rm{mo}}{{\rm{l}}^{ - 1}}$ XVI. 2nd ionisation energy =820 kJ ${\rm{mo}}{{\rm{l}}^{ - 1}}$ XVII. 3rd ionisation energy =1100 kJ ${\rm{mo}}{{\rm{l}}^{ - 1}}$ XVIII. 4th ionisation energy =1500 kJ ${\rm{mo}}{{\rm{l}}^{ - 1}}$ XIX. 5th ionisation energy =3200 kJ ${\rm{mo}}{{\rm{l}}^{ - 1}}$ Find out the number of valence electron for the atom ‘X ’

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NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The successive ionisation energy values for an element ‘X’ are given below XV. Ist ionisation energy =410 kJ

\mathrm{mo}{\mathrm{l}^{ - 1}}

XVI. 2nd ionisation energy =820 kJ

\mathrm{mo}{\mathrm{l}^{ - 1}}

XVII. 3rd ionisation energy =1100 kJ

\mathrm{mo}{\mathrm{l}^{ - 1}}

XVIII. 4th ionisation energy =1500 kJ

\mathrm{mo}{\mathrm{l}^{ - 1}}

XIX. 5th ionisation energy =3200 kJ

\mathrm{mo}{\mathrm{l}^{ - 1}}

Find out the number of valence electron for the atom ‘X ’

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Correct option: A

Option A (4) is correct because the large jump in ionization energy between the 4th and 5th ionization energies indicates that the element has 4 valence electrons.

NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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