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Are some essential elements more importa...

Are some essential elements more important than others? Explain.

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MODERN PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -REVISION EXERCISE (VERY SHORT ANSWER QUESTIONS (CARRYING 2 OR 3 MARKS))
  1. The number of elements in the 4th period of periodic table is

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  2. The number of valence electrons in Aluminium is

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  3. Are some essential elements more important than others? Explain.

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  4. Which has greater ionisation energy and why-S or P?

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  5. On moving from left to right in a period in the periodic table, the si...

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  6. For the second period elements the correct increasing order of first i...

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  7. Why are lanthanides and actinides place at the bottom of the periodic ...

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  8. Why are cations smaller than neutral atom?

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  9. Which of the following properties show gradual decrease with increase ...

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  10. Nitrogen has positive electron gain enthalpy whereas oxygen has negati...

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  11. Oxides formed by p-block elements may be (i) basic (ii) acidic (...

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  12. Explain the following a) Electronegatively of elements increase on m...

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  13. What do you understand by the terms (i) Ionization enthalpy (ii) E...

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  14. The ionization potential (I(1)) of nitrogen (Z=7) is more than oxygen ...

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  15. Explain the term electron gain enthalpy. Discuss the factors which inf...

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  16. Why is ionization enthalpy of Be more than that of B? Explain.

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  17. How does the metallic and non-metalic character vary on moving from le...

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  18. Among alkali metals which element do you expect to be least electroneg...

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  19. How would you explain the fact that the first ionisation enthalpy of s...

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  20. Arrange the elements N, P, O and S in the order of i) increasing fir...

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