Question

give Li(152pm),Cs(262pm) which atomic radius is more and why?
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Answer 1

Answer:

Cs(262pm)

Explanation:

Atomic radii trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.  Lithium and Cesium is present in group one. Cesium is present at the bottom as compared to lithium thus it has more energy levels as compared to lithium and has greater size.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.