Multiple Choice
Which of the following elements can accommodate more than eight electrons in its valence shell?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the total number of valence electrons in an atom of boron (B) in its ground state?
A
3
B
4
C
2
D
5
Verified step by step guidance1
Identify the element in question, which is boron (B).
Determine the atomic number of boron, which tells you the total number of electrons in a neutral atom. Boron's atomic number is 5.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of boron to find the distribution of electrons in its shells: $1s^2 2s^2 2p^1$.
Count the electrons in the outermost shell (the second shell, which includes the 2s and 2p orbitals). These are the valence electrons: $2 + 1 = 3$ valence electrons.
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