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Out of the two elements X and Y which ha...

Out of the two elements X and Y which has a bigger atomic radius?
(i) X has atomic number = 18 and atomic mass = 40.
(ii) Y has atomic number = 20 and atomic mass = 40.

Text Solution

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Electronic configuration of `X to 2, 8, 8 and Y to 2, 8, 8, 2.` Since X has only three electron shells while Y has four shells, Y has a bigger atomic radius.
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (VERY SHORT ANSWER (VSA) TYPE QUESTIONS)
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  3. Account for the following: Elements of group 18 are zerovalent.

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  8. Write the number of vertical columns in the periodic table. What are t...

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  11. What is the nature of oxides formed by most of p - block elements ?

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  14. Out of Li and K which has strong metallic character?

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  16. Write the formula used to determine the maximum numbers of electrons w...

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  17. Name the element and its valency which is having electronic configurat...

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  18. Lithium, sodium and potassium form a Dobereiner's triad. The atomic ma...

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  19. What do you mean by valency?

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  20. Sodium and potassium are placed in the same group of modern periodic t...

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