Multiple Choice
How many valence electrons are present in a single atom of carbon?
4
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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 a magnesium atom have?
A
2
B
4
C
6
D
8
Verified step by step guidance1
Identify the element in question, which is magnesium (Mg).
Determine the atomic number of magnesium, which is 12, meaning it has 12 electrons in a neutral atom.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of magnesium: $1s^2\ 2s^2\ 2p^6\ 3s^2$.
Recognize that the outermost shell is the third shell (3s), which contains 2 electrons, so magnesium has 2 valence electrons.
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