The principal quantum number of the valence electrons in a atom of lead is

A. 2
B. 3
C. 4
D. 5
E. 6

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  1. The principal quantum number corresponds to the number of the element's period. Lead is in the sixth period, so its quantum number is 6.

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  2. The energy level of the valence electrons of every element is the same as its period in the periodic table.
    So in this case Lead = 6 (E.)

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