ENDS SOON When the expression -3x5 +6x7-9x? - x is written with terms in descending
order (from highest to lowest), which list represents the coefficients of the
term?
A. -3, -9,6, -1
B. 1, 6,-9, -3
C. -3, 6, -9,-1
D. 6,-9, -3,-1

A formula unit represents the simplest ratio of elements in a  

✔ crystal

of an ionic compound.

A crystal is made up of  

✔ many atoms that are arranged in a regular pattern.

There are two magnesium ions for every two sulfide ions in magnesium sulfide. The ratio of Mg to S in the formula unit is  

✔ 1:1

.

Explanation:

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