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How does covalent radii vary in a period...

How does covalent radii vary in a period as well as in a group in the periodic table ? What is the reason ?

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In a period as we have from left to left to right covalent radius decreases in a period. As we move from left to right atomic number or nuclear charge increases. The pull of the electron cloud by the nucleus increases, the electron cloud shrinks and as a result the covalent radius decreases.
In a group . covalent radius increases from top to bottom . In a group as we move from top to bottom one by one new orbitals are added up thereby the size of the atom goes on increasing .
The atomic radius also goes on increasing.
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SUBHASH PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -TWO marks questions and answers
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  2. To which blocks do the elements with following atomic number belong ? ...

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  3. How does covalent radii vary in a period as well as in a group in the ...

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  4. What are s,p,d and f block elements ?

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  5. Give four characteristics of s-block elements.

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  6. Give four defects of Mendeleev's periodic table.

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  7. Give two reason , why the number of elements in first period is only 2...

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  8. On the basis of their electronic configurations, explain why alkali m...

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  9. Give the order in which the melting points of halides of sodium decrea...

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  10. Why are group I elements called alkali metals and group 17 are called ...

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  11. Give four characteristics of d-block elements.

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  12. Give any two features of Mendeleev's periodic table.

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  14. Why is melting point of LiCl lower than NaCl ?

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  17. Which alkali metal carbonate is thermally unstable and why ?

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  18. Out of O and S which has higher negative electron gain enthalpy and wh...

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  19. Predict which atom in each of the following Period has the highest fir...

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  20. Among the elements Li, K,Ca, S and Kr , which one is expected to have ...

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