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How many valence electrons does potassium (K) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons do alkaline earth metals have?
A
1
B
4
C
8
D
2
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검증된 단계별 안내1
Identify the group of alkaline earth metals in the periodic table. They belong to Group 2.
Recall that the group number for main-group elements corresponds to the number of valence electrons for those elements.
Since alkaline earth metals are in Group 2, they have 2 valence electrons.
Understand that valence electrons are the electrons in the outermost shell of an atom and determine chemical reactivity.
Therefore, alkaline earth metals have 2 valence electrons.
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