Answer: Option (a) is the correct answer.
Step-by-step explanation:
Atomic number of phosphorous is 15 and its electronic configuration is
.
As there are 3 valence electrons in a single phosphorous atom. Therefore, to attain stability it will readily lose three electrons and thus forms a
charge.
For example, in
there will be sharing of electrons between the phosphorous and chlorine atom.
Hence, a phosphorous atom can share its three valence electrons and thus forms three covalent bonds to have a complete octet in its valence shell.