How many electron shells does Sr have?
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Strontium, according to the periodic table, has a ground-state electron configuration of [Kr]5s2 (I did not want to write out the full one)The number at the very front, in this case a 5, describes the principal quantum number nThis parameter, while describing the general energy level of electrons within a particular shell, also indicates the total quantity of shellsFor example, Calcium and Copper both have four energy shellsAluminum has three shellsSimply write out the full electron configuration for a particular element and look for the highest numberAluminum is 1s22s22p63s23p1There are three shells for aluminum.
