QQuestionChemistry
QuestionChemistry
How many valence electrons does strontium (Sr) have?
A. 1
B. 2
C. 5
D. 6
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Answer
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Step 1:I'll solve this step-by-step using the guidelines you specified:
Step 2:: Determine Strontium's Position on the Periodic Table
- Strontium (Sr) is located in Group 2 (alkaline earth metals) of the periodic table - Its atomic number is 38
Step 3:: Electron Configuration
- The electron configuration of strontium is $$1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2}
Step 4:: Count Valence Electrons
- Group 2 elements have $$2$$ valence electrons
- For Group 2 elements, the number of valence electrons is equal to the group number - These are the electrons in the outermost shell (4s^{2} in strontium's case)
Step 5:: Verify the Answer
- Counting the valence electrons confirms there are $$2$$ valence electrons
Final Answer
The key is recognizing that Group 2 elements always have 2 valence electrons, which are located in the s-orbital of the outermost shell.
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