Question:
Which of the following order is wrong :
Which of the following order is wrong :
Updated On: Apr 21, 2025
NH3 < PH3 < AsH3 – Acidic
Li < Be < B < C – Ist IP
Al2O3 < MgO < Na2O < K2O - Basic
Li+< Na+< K+< Cs+- Ionic radius
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The Correct Option is B
Solution and Explanation
The correct option is (B) : Li < Be < B < C – Ist IP
Li⟶1s22s1; Be⟶1s22s2;B⟶1s22s22p1;C⟶1s22s22p2
Li<B<Be<C
Be is having higher ionization potential than B as Be has fully filled 2s− orbital due to which it gets extra stability.
Li⟶1s22s1; Be⟶1s22s2;B⟶1s22s22p1;C⟶1s22s22p2
Li<B<Be<C
Be is having higher ionization potential than B as Be has fully filled 2s− orbital due to which it gets extra stability.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family