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Chemistry 18 Online
OpenStudy (anonymous):

A principal quantum number refers to

OpenStudy (anonymous):

it refers to how many shells an atom have. a quantum shell refers to shell which contains subshells

OpenStudy (anonymous):

formula is 2n2

OpenStudy (anonymous):

Hi,I think it refers to quantum of energy required by eletrons during changing orbits in a atom of an element.

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