Multiple Choice
Which of the following represents the valence electron configuration for a phosphorus (P) atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does the element boron (B) have?
A
2
B
5
C
3
D
4
Verified step by step guidance1
Identify the atomic number of boron (B), which is 5. This means boron has 5 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of boron: $1s^2 2s^2 2p^1$.
Recognize that the first shell (1s) is full and not part of the valence shell; the valence shell is the second shell containing $2s^2 2p^1$ electrons.
Count the electrons in the outermost shell: $2 + 1 = 3$ valence electrons for boron.
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