Answer:
the answer to this is 7 over 13
Answer:
Selenium atoms have 34 electrons and the shell structure is 2.8. 18.6. The ground state electron configuration of ground state gaseous neutral selenium is [Ar].
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Answer: The answer is -1
Explanation: 3+3 = 6 and then following the order of operations you substract 7 giving you the answer -1