The number of electrons shared between the atoms in a I₂ molecule is two (2).
Explanation:
An iodine atom has 53 electrons and its electron configuration is;
2. 8. 8. 18. 17
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁵
Note that the outermost p shell has 5 electrons while it can accommodate a maximum of 6 for stable electron configuration. Therefore an Iodine atom needs one (1) electron to acquire nobility. Two Iodine atoms will, therefore, share two electrons (each from one of their p sub-shell ) by covalent bonds to form I₂
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