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Among the elements of the third period, ...

Among the elements of the third period, identify the element.
a) With highest first ionization enthalpy.
b) That is the most reactive metal.
c) With the largest atomic radius.

Answer

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Among the elements B , Al , C and Si . a. Which has the highest first ionization enthalpy? b. Which has most negative electron gain enthalpy? c. Which has the largest atomic radius? d. Which has the most metallic character?

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Knowledge Check

  • Among the following, the elements of highest first ionisation enthalpy is

    A
    C
    B
    F
    C
    Be
    D
    Ne

  • Assertion: Of all the elements, helium has the highest value of first ionization enthalpy. Reason: Helium has the most positive electron gain enthalpy of all the elements.

    A
    If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
    B
    If both (A) and (R) are correct, but (R) is not the correct explanation of (A)
    C
    If (A) is correct, but (R) is incorrect.
    D
    If both (A) and (R) are incorrect.

  • Ionization energies of five elements, are given below: Most reactive metal is :

    A
    A
    B
    B
    C
    C
    D
    D

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    Sodium and sulphur are two elements in the third period in the periodic table. (Atomic number Na-11, S-16) a) Which one of them has the highest ionization energy? b)Which one has the highest electronegative nature? c) To which period does these elements belong? Write down the electronic configuration of the element just above the sulfur in the same group of the periodic table.

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    The order of first ionization energies of the elements Li,Be,B,Na is :

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