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How many valence electrons are present in the outermost shell of a neutral atom with 15 electrons?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does the element lead (Pb) have?
A
4
B
2
C
6
D
8
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검증된 단계별 안내1
Identify the atomic number of lead (Pb), which is 82, to understand its electron configuration.
Write the full electron configuration of lead (Pb) using the Aufbau principle, filling orbitals in order of increasing energy.
Focus on the outermost shell (the highest principal quantum number, n) to determine the valence electrons; for Pb, this is the 6th shell.
Count the electrons in the 6s and 6p orbitals, as these are the valence electrons for main group elements like lead.
Sum the electrons in these outermost orbitals to find the total number of valence electrons for lead.
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