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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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Along the period, ionisation energy increases, but the first ionisation energy of Be is more than that of boron, and that of nitrogen is more than that of oxygen. Give reason.

Why the first ionisation energy of carbon atom is greater than that of boron atom whereas, the reverse is true for the second ionisation energy.

Knowledge Check

  • Assertion (A): First ionisation energy of beryllium is greater than that of boron. Reanos (R): Boron has larger size than beryllium.

    A
    (a) Both A and R are true and R is the correct
    explanation of A
    B
    (b) both A and R are true and R is not the correct
    explanation of A
    C
    (c) A is true, R is false
    D
    (d) Ais false, R is true

  • The first ionisation energy of silicon is lower than that of

    A
    Aluminium
    B
    carbon
    C
    potassium
    D
    calcium

  • The ionisation energy of nitrogen is more than that of oxygen because

    A
    Of the extra stability size of nitrogen is more than that of oxygen because
    B
    Of the smaller size of nitrogen
    C
    The former contains less number of electrons
    D
    The former about ionisation potential

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    The ionization energy of N is more than that of oxygen because:

    The first ionization energy of carbon atom is greater than that of boron aton whereas the reverse is true for second ionization energy. below

    The first ionisation energy of B is less than that of Be because

    The first ionisation energy of Al is smaller than that of Mg because :

    The first ionisation energy is maximum for

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