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QUESTION

# What is the formula for magnesium iodide?

Magnesium metal forms a doubly charged cation. Iodide forms a singly charged anion.

Mg^(2+) + 2I^(-) rarr MgI_2

How do you know what ions these form? Look at . Magnesium comes from Group 2; as a metal it needs to lose 2 electrons to assume a Noble Gas configuration (that of neon); on the other hand iodine needs to gain 1 electron to assume the xenon configuration. The ion formation reflects this tendency.

What is the formula of potassium oxide?