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Which of the element is expected to have...

Which of the element is expected to have lowest first ionisation enthalpy

A

Sr

B

Al

C

Xe

D

S.

Text Solution

Verified by Experts

The correct Answer is:
A
S lies is the 3rd, As in the 4 th Sr and Xe lie in the fifth period. Except noble gases in general ionisation energy of the elements decreases as the serial number of the period increases. Thus ionisation enthalpies of S and as are higher than that of Sr but Xe being the noble gas has the highest enthlpy . thus Sr has the lowest ionisation enthalpy.
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Knowledge Check

  • Which elements is expected to have lowest first ionization enthalpy ?

    A
    Sr
    B
    As
    C
    Xe
    D
    S

  • Four successive members of the first row transition elements are listed below with their atomic number. Which one of them is expected to have the highest third ionisation enthalpy ?

    A
    Vanadium `(Z = 23)`
    B
    Manganese `(Z = 25)`
    C
    Chromium `(Z = 24)`
    D
    Iron `(Z = 26)`

  • Four succesive members of the first row tranition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

    A
    Vanadium (Z=23)
    B
    Chromium (Z=24)
    C
    Iron (Z=26)
    D
    Manganese (Z=25)

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    From amongst Be, B and C, Choose the element with highest and lowest first ionization enthalpy.

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