Multiple Choice
How many valence electrons are present in a carbon dioxide (CO_2) molecule?
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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
How many valence electrons does beryllium (Be) have?
A
8
B
6
C
4
D
2
Verified step by step guidance1
Identify the element in question, which is beryllium (Be).
Determine the atomic number of beryllium, which is 4, meaning it has 4 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of beryllium: $1s^2 2s^2$.
Count the electrons in the outermost shell (the second shell), which are the valence electrons. For beryllium, this is 2 electrons in the $2s$ orbital.
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