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What is the number of electrons shared between the atoms in an I2 molecule?

June 2017 NY Regents Chemistry Exam


11 What is the number of electrons shared between the atoms in an I2 molecule?

(1) 7

(2) 2 (3) 8

(4) 4



Solution: Iodine has 7 valence electrons according to the electron configuration on the Periodic Table. All atoms want 8 electrons. Iodine needs one more electron to have a full octet. That means it wants to share one bond with another iodine atom. One bond has two electrons in it.

Answer: 2


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