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The atomic size of beryllium is smaller ...

The atomic size of beryllium is smaller than the atomic size of lithium. Give reason.

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In lithium (atomic number = 3) the outermost electron of L-shell is attracted by 3 protons. But in beryllium (atomic number = 4) the outermost electrons of L-shell are attracted by 4 protons. That is, the electrons of L-shell are attracted strongly towards the nucleus in case of beryllium as compared to lithium. Therefore, the atomic size of beryllium is smaller than the atomic size of lithium.
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ICSE-PERIODIC PROPERTIES OF ELEMENTS -QUESTION
  1. The size of potassium atom is greater than the size of sodium atom. Gi...

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  2. In halogens (group 17) the atomic radius of chlorine is greater than t...

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  3. The atomic size of beryllium is smaller than the atomic size of lithiu...

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  4. The atomic size of lithium is larger than the atomic size of beryllium...

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  5. Look at the atomic radii of some elements of the second period and ans...

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  6. Look at the atomic radii of some elements of the second period and ans...

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  7. Look at the atomic radii of some elements of the second period and ans...

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  8. Look at the atomic radii of some elements of the second period and ans...

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  9. The ionisation energy of potassium is lower than that of sodium. Give ...

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  10. Give reason - The oxidising power of elements increases from left to r...

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  11. Fill in the blank from the choices given in brackets : The energy ...

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  12. Which one of the following elements of period 2 has high electron affi...

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  13. Define the following terms: Ionisation potential

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  14. Define the following terms: Electron affinity .

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  15. Answer the following questions: The metals of Group 2 from top to ...

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  16. The metals of Group 2 in the periodic table from top to bottom are - B...

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  17. An element has an atomic number 16. State the period to which it belon...

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  18. An element has an atomic number 16. State the number of valence electr...

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  19. Atomic number of element Z is 16. Is Z a metal or a non metal.

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  20. There are three elements E, F, G with atomic numbers 19, 8 and 17 res...

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