Multiple Choice
Which part of the atom is responsible for forming chemical bonds?
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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 magnesium (Mg) have?
A
6
B
2
C
4
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 total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of magnesium: $1s^2 2s^2 2p^6 3s^2$.
Identify the electrons in the outermost shell (the 3rd shell), which are the $3s^2$ electrons, so magnesium has 2 valence electrons.
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