[Kr] 5s2 4d10 5p5
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Iodine typically forms a negatively charged ion (anion) with a charge of -1. Therefore, the correct symbol for an iodine ion would be I-.
The correct molecular formula for iodine pentafluoride is IF5. It consists of one iodine atom and five fluorine atoms in the compound.
Literally, the correct formula for potassium and iodine at standard temperature and pressure would be " K and I2". The formula for the compound formed between potassium and iodine, however, is KI.
No, "Ca plus 2" is not correct notation for an ion. The correct notation would be Ca^2+, which represents a calcium ion with a 2+ charge due to the loss of two electrons.
The formula of diiodine hexachloride is I2Cl6 or (ICl3)2. Both are correct.