The way I see it is that HI doesn't share an electron between H 1s and I 5p. Rather, HI is a strong acid, it ionizes completely and I look at it as an ionic compound in which the 1s electron from H is transferred to the 5p5 (to make 5p6 and that with the 5s2 makes 8 electrons in the outer shell).
https://www.google.com/search?q=electron+configureation+for+I&ie=utf-8&oe=utf-8
HI is formed from the overlap of a hydrogen 1s orbital with an iodine 3p orbital? is that correct? I am having trouble with the iodine orbital, thank you.
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