Why the size of silicon atom larger than carbon atom
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As expected silicon is larger than carbon due to the presence of a second shell: i.e., C = 1s2 2s2 2p2 while Si = 1s2 2s2 2p6 3s2 3p2. ... Atomic, covalent, and van der Waals radii of carbon and silicon.
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In silicon, the electrons spread into the 3rd energy level, whereas in carbon, it is only to the 2nd energy level. This difference occurs because of carbon in the 2nd period, but silicon in the 3rd. Silicon atom is larger than the carbon atom. Moreover, another difference between silicon and carbon is that the silicon is less reactive than carbon.
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