In the following process,what is the missing particle? 
N + 
He → ________ + 
P
Definitions:
Reception Area
A space designated in an office or building where visitors are greeted and waited before being escorted to their destination.
Decrease Noise
Reducing unwanted sound or background interference to improve clarity or quality of the environment.
Live Plants
Living organisms that belong to the kingdom Plantae, which grow and photosynthesize to produce their own food.
Major Disadvantage
A significant negative aspect or drawback that can impact effectiveness, efficiency, or desirability.
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