1. Tardigrade
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  3. Chemistry
  4. The decreasing order of the ionisation potential of the following elements is

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Q. The decreasing order of the ionisation potential of the following elements is

Classification of Elements and Periodicity in Properties

Solution:

Ionisation energy increases from left to right in a period but ionisation energy $_{\text {group- }-2}>$ ionisation energy $_{\text {group }-13}$ and ionisation energy $_{\text {group- }-15}>$ ionisation energy $_{\text {group- } 16}$ This is because of stable electronic configuration of group $2 \left(n s^{2}\right)$ and group $15\left(n s^{2} n p^{3}\right)$.

Thus, $Ne > Cl > P > S > Mg > Al$ : Ionisation potential