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Which element has 2 energy levels and 5 valence electrons?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence (outermost) electrons do lithium (Li) and potassium (K) each have?
A
1
B
2
C
8
D
3
검증된 단계별 안내1
Identify the group number of lithium (Li) and potassium (K) in the periodic table. Both elements belong to Group 1, which is the alkali metals group.
Recall that elements in Group 1 have a single electron in their outermost shell, which defines their valence electrons.
Understand that valence electrons are the electrons in the outermost energy level (shell) of an atom and are important for chemical bonding.
Since both lithium and potassium are in Group 1, each has exactly 1 valence electron.
Therefore, the number of valence electrons for both lithium and potassium is 1.
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