Phosphine is a highly flammable gas used in semiconductor industries. Determine the number of valence electrons, lone pairs, and bonding pairs in phosphine based on its Lewis structure given below:

• A. Number of valence electrons = 8
  Bonding pair/s = 3
  Lone pair/s = 1
• B. Number of valence electrons = 8
  Bonding pair/s = 1
  Lone pair/s = 3
• C. Number of valence electrons = 6
  Bonding pair/s = 3
  Lone pair/s = 1
• D. Number of valence electrons = 6
  Bonding pair/s = 1
  Lone pair/s = 3

Answer: (A)