S denotes the ''number of shared electron pairs by an atom'', Hence, Silicon shares its 4 electrons with 4 Cl-atoms. Thus the Value of S is 4 in SiCl₄ .It is also known as covalency
What is Covalency ?
The number of covalent bonds that a particular atom can make with other atoms in forming a molecule.
Covalent bond id formed by the sharing of electron between two atoms.
Hence, Silicon shares its 4 electrons with 4 Cl-atoms. Thus the Value of S is 4 in SiCl₄ . It is also known as covalency
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