QQuestionChemistry
QuestionChemistry
"According to the periodic table, how many electrons does bromine (#35) have in its valence level?
A. 17
B. 35
C. 2
D. 7"
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Answer
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Step 1:I'll solve this step-by-step using the specified formatting guidelines:
Step 2:: Determine Bromine's Atomic Number and Position
- Bromine (Br) has atomic number 35 - It is located in Group 17 (VIIA) of the periodic table
Step 3:: Electron Configuration Analysis
- The electron configuration of bromine is $$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{5}
- Electrons in the outermost shell (4p) determine valence electrons
Step 4:: Count Valence Electrons
- Bromine has $$7$$ electrons in its outermost shell (4p)
- Group 17 elements have 7 valence electrons
Step 5:: Verify the Answer
- Counting the electrons in the 4p subshell confirms 7 valence electrons
Final Answer
Explanation: Bromine, as a Group 17 (VIIA) element, has 7 valence electrons in its outermost shell, which determines its chemical properties and reactivity.
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