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Ionization energy of beryllium is greate...

Ionization energy of beryllium is greater than the ionization energy of boron. Why?

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`Be (Z =4) 1s^2 2s^2`. It has completely filled valence electrons, which requires high `IE_1`.
`B (Z =5) 1s^2 2s^2 2p^`. It has incompletely filled valence electrons, which requires comparatively less `IE_1`. Hence `I.E_1. Begt I.E_1 B`.
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FULL MARKS-PERIODIC CLASSIFICATION OF ELEMENTS -Additional Questions(2 MARK QUESTIONS)
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  2. What are isoelectronic ions ? Give examples.

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  3. Define lonization energy. Give its unit.

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  4. Ionization energy of beryllium is greater than the ionization energy o...

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  5. Ionization energy of nitrogen is greater than the ionization energy of...

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  6. Define electron gain enthalpy or electron affinity. Give its unit.

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  7. Electron gain enthalpy is F is less negative than Cl Why ?

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  8. Electron affinity of oxygen is less negative than sulphur. Justify thi...

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  9. Explain about the factors that affect electronegativity.

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  10. Explain about periodic variation of electronegativity across a period.

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  11. Explain about the period variation of electronegativity along a group.

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  12. Define valency . How is it determined ?

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  13. What is the basic difference in approach between Mendeleev's periodic ...

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  14. On the basis of quantum numbers, justify that the sixth period of the ...

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  15. Why do elements in the same group have similar physical and chemical p...

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  16. How do atomic radius vary in a period and in a group? How do you expla...

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  17. Explain why cation are smaller and anions are larger in radii than the...

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  18. What is basic difference between the terms electron gain enthalpy and ...

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  19. Would you expect the first lonization enthalpies of two isotopes of th...

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  20. Write the general electronic configuration of sp-d-, and f-block eleme...

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