An atom has atomic number 17. How many electrons are in its outer shell?
Answer and explanation
Correct answer: C.
- Step 1: Fill the shells in the order 2, 8, 8, 2: 2, 8, 7.
- Step 2: The outer shell holds 7 electrons.
Answer
.
Why not the others: : All electrons were counted. : An inner shell was counted. : The number missing from a full shell of eight was given.
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