The principal quantum number of the valence electrons in an atom of lead is:
A. 2
B. 3
C. 4
D. 5
E. 6
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The principal quantum number is the PERIOD in which an element in location.
The principal quantum number is the PERIOD in which an element is located.**
To determine the principal quantum number of the valence electrons in an atom of lead, we need to look at the electron configuration of lead.
The electron configuration of lead is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p².
The valence electrons are the electrons in the outermost energy level, which in this case is the 6th energy level (n=6). Therefore, the principal quantum number of the valence electrons in an atom of lead is 6.
So, the correct answer is E. 6.