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MA_775_DIABLO [31]
3 years ago
14

What principle do we use in writing the formula of an ionic compound such as NaCl or MgI2? How do we know that two iodide ions a

re needed for each magnesium ion, whereas only one chloride ion is needed per sodium ion?
Chemistry
1 answer:
Savatey [412]3 years ago
6 0

Answer:

We know based on the charges of each ion and the fact that they must always sum to 0

Explanation:

Na only has one outer electon to give so it is always +1

Mg has two outer electrons so it always gets +2

Halogens have one "missing" electron in their outer shell so they get a -1

For NaCl  (+1) + (-1) = 0

For MgI2 (+2) + 2(-1) = 0

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