June 2023 NY Regents Chemistry Exam
10 What is the number of electrons shared between the two atoms in an O2 molecule? (1) 6
(2) 2 (3) 3
(4) 4
Solution: Oxygen can be found on the Periodic Table. Its electron configuration is 2-6 which means it has 6 valence electrons. Each element (other than H and He) wants 8 valence elections. It needs 2 more electrons to have 8. Therefore, when an oxygen atom will bond to another oxygen atom, it will form a double bond. Each bond has 2 electrons. Double bond has 2*2= 4 electrons
Answer: 4
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