A. Helium
B. Hydrogen
C. Chlorine
D. Nitrogen
Submitted by: MIAN TARIQ AZIZ
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
(Sponsored by Sir Tauqeer)
