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What is meant by atomic radius ? Explain...

What is meant by atomic radius ? Explain why it decreases across a period ?

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The distance from centre of nucleus to outermost shell of an atom is atomic radius.
Atomic radius decreases across a period because electron is added in the same shell. So attraction between nucleus and valence shell increases due to which outermost shell is pulled in closer to the nucleus.
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OSWAAL PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TOPIC:2- SHORT ANSWER TYPE QUESTIONS-II
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  2. The atomic numbers of five elements A, B, C, D and E are 6, 8, 3, 7 an...

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  3. What is meant by atomic radius ? Explain why it decreases across a per...

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  4. a] Name the element with atomic number 17.   b]To which period does i...

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  5. "Electronegativity is the case of gaining electrons". (a) Which type...

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  6. How many groups and periods are there in the modern periodic table? Ho...

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  7. Write the number of periods the modern periodic table has. State the c...

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  8. (a) Define the following terms: (i) Valency, (ii) Atomic size. (b)...

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  9. What is meant by a group in the Modern Periodic Table? How do the foll...

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  10. Name:  a) three elements that have a single electron in their outerm...

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  11. Calcium is an element with atomic number 20. Stating reason for each o...

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  12. Name any two elements of group one and write their electronic configur...

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  13. An element 'M' with electronic configuration (2,8,2) combines separate...

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  14. Two elements P and Q belong to the 3rd period of the Modern Periodic T...

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  15. An element 'X' (Atomic number = 20) burns in the presence of oxygen to...

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  16. An element 'X' belongs to third period and second group of the Modern ...

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  17. The atomic number of an element 'X' is 19. (i) Write its electronic ...

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  18. An element 'X' belongs to the 3rd period and group 16 of the Modern Pe...

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  19. An element X has mass number 35 and number of neutrons = 18. Write ato...

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  20. Three elements 'X', 'Y' and 'Z' have atomic numbers 7, 8 and 9 respect...

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