객관식
How many electrons are present in the third shell (n = 3) of a sodium (Na) atom in its ground state?
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Valence Electrons of Elements
객관식
How many valence electrons does the element phosphorus (P) have?
A
3
B
7
C
8
D
5
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검증된 단계별 안내1
Identify the element in question, which is phosphorus (P).
Determine the group number of phosphorus in the periodic table. Phosphorus is in group 15 (or group V in older notation).
Recall that the group number for main-group elements corresponds to the number of valence electrons for that element.
Since phosphorus is in group 15, it has 5 valence electrons.
Therefore, the number of valence electrons in phosphorus is 5.
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