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Define ionisation energy....

Define ionisation energy.

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Ionisation energy is required to remove an electron from a neutral gaseous atom.
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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.

The first ionisation energy of magnesium is greater than that of sodium, whereas the recerse is true for second ionisation energy. Explain.

Knowledge Check

  • Arrange S, P and As in order of increasing ionisation energy.

    A
    `S lt P lt As`
    B
    `P lt S lt As`
    C
    `As lt S lt P`
    D
    `As lt P lt S`

  • If first ionisation energy of hydrogen be E , then the ionisation energy of He^+ would be :

    A
    E
    B
    2 E
    C
    0.5 E
    D
    4 E

  • The first ionisation energy is maximum for

    A
    `Na`
    B
    `Mg`
    C
    `K`
    D
    `Kr`

    • Similar Questions

    Explore conceptually related problems

    If the first ionisation energy of H-atom is 13.6 eV, then the second ionisation energy of He-atom is :

    If the first ionisation energy of H-atom is 13.6 eV, then the second ionisation energy of He-atom is :

    The minimum amount of energy which is required to remove an outermost electron from any isolated neutral gaseous atom is known as first ionisation energy. These are the following factors which effect ionisation energy. (i) Ionisation energy prop (1)/("Principal quantum number") (ii) Ionisation energy prop Z_(eff) (iii) If orbitals are fully filled or half filled so stability will be more and ionisation energy will be high. (iv) If penultimate electron will effectively shield the nucles, ionisation energy will be less and vice versa. Which of the following has maximum Ist ionisation energy?

    The minimum amount of energy which is required to remove an outermost electron from any isolated neutral gaseous atom is known as first ionisation energy. These are the following factors which effect ionisation energy. (i) Ionisation energy prop (1)/("Principal quantum number") (ii) Ionisation energy prop Z_(eff) (iii) If orbitals are fully filled or half filled so stability will be more and ionisation energy will be high. (iv) If penultimate electron will effectively shield the nucles, ionisation energy will be less and vice versa. Choose the correct order of Ist ionisation energy

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

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