Which of the following statements is incorrect?

  • A
    The second ionization energy of sulphur is greater than that of chlorine
  • B
    The third ionization energy of phosphorus is greater than that of aluminium
  • C
    The first ionization energy of aluminium is approximately the same as that of gallium
  • D
    The second ionization energy of boron is greater than that of carbon

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The element having the highest first ionization enthalpy is

Which of the following electrons should have the highest value of ionisation energy (for the same value of the principal quantum number)?

The $IE_1$ and $IE_2$ of three elements $A$,$B$,and $C$ are given as : ( $IE$ in $kJ/mol$ )
Element $A, B, C$
$IE_1$ $400, 550, 1150$
$IE_2$ $2650, 1070, 2090$

Identify the element which represents a nonmetal.

The first ionisation potential will be maximum for

How would you explain the fact that the first ionisation enthalpy of sodium is lower than that of magnesium,but its second ionisation enthalpy is higher than that of magnesium?

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