What is the missing reagent in the reaction below? 
Definitions:
Orbital
A mathematical function describing the location and wave-like behavior of an electron or pair of electrons in an atom.
Electron
A subatomic particle with a negative charge, orbiting the nucleus of an atom and involved in chemical bonds and electricity.
S Orbital
A type of atomic orbital that is spherical in shape, representing the probability distribution of an electron.
Shape
The external form, contours, or outline of an object or figure, often influencing its functionality and perceived aesthetics.
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