Final answer:
The chemical symbol for Hydrogen is H, which represents a single atom of hydrogen, differing from H₂ (a diatomic hydrogen molecule) or 2H (two separate atoms).
Step-by-step explanation:
The chemical symbol for Hydrogen is b) H. This symbol represents a single atom of hydrogen. It is important to distinguish between different forms of hydrogen notation in chemical formulas. For instance, H₂ is the molecular formula for diatomic hydrogen, which consists of two hydrogen atoms bonded together. On the other hand, 2H would represent two separate hydrogen atoms, not bonded. The notation 2H₂ would indicate two molecules of diatomic hydrogen. Each of these notations represents distinct chemical species.