Molecular structure of Magnesium bromide (CAS NO.7789-48-2) is:

Product Name: Magnesium bromide
CAS Registry Number: 7789-48-2
IUPAC Name: magnesium dibromide
Molecular Weight: 184.113 [g/mol]
Molecular Formula: Br₂Mg
H-Bond Donor: 0
H-Bond Acceptor: 2 
EINECS: 232-170-9
Melting Point: 711 °C(lit.)
Density: 3.72 g/mL at 25 °C(lit.)
Product Categories: Inorganics;Inorganic Salts;Magnesium Salts;MagnesiumMetal and Ceramic Science;Salts;Synthetic Reagents;Crystal Grade Inorganics

 Magnesium bromide (CAS NO.7789-48-2) is often used as a mild sedative and as an anticonvulsant for treatment of nervous disorders.Also, it is used at a catalyst for many reactions, typically as a solvent or used as a Grignard reagent.

Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
WGK Germany: 1

 Magnesium bromide , its cas register number is 7789-48-2. It also can be called Magnesium dibromide .It is a white hexagonal crystals, hygroscopic. It is water soluble and soluble in alcohol. It can be found naturally in small amounts in some minerals such as: bischofite and carnallite, and in sea water, such as that of the Dead Sea.