Question

Mark the incorrect statement about ionization energy:(a) it is neasured in kJmol-1(b) it is absorption of energy(c) it decreases in a period(d) it decreases in a group

Answer 1

C) ioniaation energy decreases in a period. Is a wrong statement

Answer 2

The incorrect statement about Ionization Energy is 'It decreases in a Period ' i.e. Option 'C'.

• Ionization Energy is the amount of energy required to remove an electron from an isolated gaseous atom. Its SI unit is KJ/mol. So, option A is correct.
• Since the energy is required to remove an electron, the reaction becomes non-spontaneous and absorbs energy to initiate the process. So, option B is also correct.
• Ionization energy is inversely proportional to the size of an atom. Also, across the period size decrease which means Ionization Energy increases across the period. So, option C is incorrect.
• As goes down the group, the size of an atom increases. And with the increase in size, the Ionization Energy decreases down the group. So, option D is also correct.

Hence, the incorrect statement is option 'C'.

#SPJ2