The complete orbital notation diagram of an atom is shown. Based on the diagram, what values can be assigned to the principal quantum number for the electrons in the atom? What information does this quantum
number provide about the location of the electron?

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metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

it is reliable if two scientists recorded it