QQuestionChemistry
QuestionChemistry
"How many valence electrons does bromine
([Ar]4s^23d^104p5) have?
A. 5
B. 7
C. 15
D. 17 "
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Answer
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Step 1:
To determine the number of valence electrons for bromine, we first need to identify the noble gas configuration and the outermost energy level.
Step 2:
The given electron configuration for bromine is [Ar]4s^2 3d^10 4p^5. Here, [Ar] represents the noble gas argon's electron configuration, 18 electrons, which are not involved in chemical bonding.
Step 3:
Now, let's count the number of electrons in the outermost energy level, which is the 4th energy level in this case (4s^2 3d^10 4p^5). The sum of the superscripts for the 4th energy level is 2 + 10 + 5 = 17.
Step 4:
Therefore, bromine has 17 valence electrons, which corresponds to option D.
Final Answer
Bromine has 17 valence electrons (option D).
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