Consider the radial distribution shown below for an electron in an s atomic orbital where r is the distance of the electron from the nucleus. 
Identify: (1) where the atomic nucleus is located; (2) a radial node; (3) the most probable distance of the electron from the nucleus; and (4) the principle quantum number for this orbital.
Definitions:
Reaction
A reaction involves the transformation of one or more substances into different substances through the breaking and forming of chemical bonds.
Exothermic
An exothermic reaction is a chemical reaction that releases heat and energy to its surroundings.
Activation Energy
Activation energy is the minimum quantity of energy which the reacting species must possess in order to undergo a specified reaction.
Flashover
An event in which an entire room or area bursts into flames almost simultaneously, often due to the rapid spread of fire through combustible materials.
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