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The number of elements in the 4th period...

The number of elements in the 4th period of periodic table is

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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. What do you underrstand by negative value of electro-gain enthalpy of ...

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  2. Water is a compound and not a mixture. Justify the statement giving tw...

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  3. The number of elements in the 4th period of periodic table is

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  4. The number of valence electrons in Aluminium is

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

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

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

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

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

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  10. Why are cations smaller than neutral atom?

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

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

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

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

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

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

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

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

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

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

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