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18 July, 13:03

Which element, when combined with Iodine, would most likely form an ionic compound?

Potassium (K)

Carbon (C)

Chlorine (Cl)

Phosphorous (P)

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  1. 18 July, 13:16
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    In an ionic compound the atoms are linked via ionic bonds. These are formed by the transfer of electrons from one atom to the other. The atom that loses electrons gains a positive charge whereas the atom that accepts electrons gains a negative. This happens in accordance with the octet rule wherein each atom is surrounded by 8 electrons

    In the given example:

    The valence electron configuration of Iodine (I) = 5s²5p⁵

    It needs only one electron to complete its octet.

    In the given options:

    K = 4s¹

    C = 2s²2p²

    Cl = 3s²3p⁵

    P = 3s²3p³

    Thus K can donate its valence electron to Iodine. As a result K, will gain a stable noble gas configuration of argon while iodine would gain an octet. This would also balance the charges as K⁺I⁻ creating a neutral molecule.

    Ans: Potassium (K)
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