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Write the electronic configuration of th...

Write the electronic configuration of the element with atomic number of `9, 11, 21` and `36`. Predict the folloiwng from these configurations:
(a) Which of them has the lowest ionisation potential ?
(b) Which of them has the highest electron gain enthalpy ?
(c) Which of them are non-metals?
(d) Which of them has zero electron gain enthalpy ?

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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. Fe^(2+) and Fe^(3+) can be distinguished by

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  2. Which of the following pairs of elements would have a more negative el...

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  3. Write the electronic configuration of the element with atomic number o...

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

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

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

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  7. The number of valence electrons in Aluminium is

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

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

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

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

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

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  13. Why are cations smaller than neutral atom?

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

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

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

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

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

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

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

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