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The first ionisation energy of beryllium...

The first ionisation energy of beryllium is more than that of boron because

A

boron has higher nuclear charge

B

boron has only one electron in p-subshell

C

atomic size of boron is less than that of beryllium

D

atomic size of boron is more than that of beryllium

Text Solution

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Boron has only one electron in p-subshell, hence it can be lost easily, while beryllium has comparatively stable configuration `(1s^(2), 2s^(2))` hence, cannot given an electron easily, consequently itas IE is greater.
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BITSAT GUIDE-PERIODIC PROPERTIES-Practice Exercise
  1. Which one of the following is correct increasing order of size ?

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  2. Ionic radii vary in

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  3. The first ionisation energy of beryllium is more than that of boron be...

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  4. Among the following, the element with highest ionisation potential is

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  5. The isoelectronic ion having lowest ionisation energy is

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  6. The value in electron-volt per atom which represent the first ionisati...

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  7. The pair in which the ionisation energy of first species is less than ...

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  8. How many Cs atoms can be converted to Cs^+ ions by 1 joule energy , I...

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  9. How many joules of energy must be absorbed to convert Li to Li^(+) , a...

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  10. The incorrect statements among the following is

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  11. Ionisation enthalpy of Na would be same as

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  12. Which one of the following statements is incorrect in relation to ioni...

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  13. The formation of the oixde ion, O^(2+)(g) from oxygen atom requires fi...

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  14. Which one of the following arrangements represents the correct order o...

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  15. Electronic configurations of four elements A, B, C and D are given bel...

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  16. In which of the following options the order arrangement does not agree...

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  17. The electron affinity values (in kJ mol^(-1)) of three halogens, x,y, ...

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  18. Which one of the following statements is false ?

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  19. Which of the following element has highest electronegativity ?

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  20. In C,N,O and F the electronegativity

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