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QUESTION

# What is the chemical formula for magnesium bromide?

MgBr_2

The Magnesium atom has two outermost electrons that need pairing up and each bromine atom requires one electron. So, two Bromine atoms get attached to a magnesium atom. The positive part (Magnesium) is written first and Bromine is written latter. So the molecular formula becomes;

MgBr_2

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