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OpenStudy (vera_ewing):
Given the following three electron configurations: 1s2 2s2 2p5 How many core electrons does this element have? A. 4 B. 5 C. 2 D. 9
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OpenStudy (vera_ewing):
1s^2 2s^2 2p^5
OpenStudy (vera_ewing):
@TheSmartOne
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