1. Why does Si have a larger atomic radius than C? The valence electrons in C fe

Question

1. Why does Si have a larger atomic radius than C?

The valence electrons in C feel a stornger effective nuclear charge than those in Si.

B) Si is lower down the group than C.

The valence electrons in Si feel a stronger effective nuclear charge than those in C.

The valence electrons in Si and C feel a similar Zeff. Those in C are in a higher energy level.

The valence electrons in Si and C feel a similar Zeff. Those in Si are in a higher energy level.

The valence electrons in C feel a stornger effective nuclear charge than those in Si.

B) Si is lower down the group than C.

The valence electrons in Si feel a stronger effective nuclear charge than those in C.

The valence electrons in Si and C feel a similar Zeff. Those in C are in a higher energy level.

The valence electrons in Si and C feel a similar Zeff. Those in Si are in a higher energy level.

Explanation / Answer

Si and C are memver of 4th group. Si have larger atomic volume and atomic radii than C. C occurs on top of the group Si occurs below the C. As we move down atomic radii increases due to effect of extra shell being added from member to member which outweigh the effect of increased nuclear charge.

So Option A is wrong because Si have more effective nuclear charge than carbon.

D and E statement also wrong because valence electrons do not feel similar Zeff.

B and C statement are correct but C is a reason for the statemnt B

so the correct answer is C.

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