Molecular structure of Sodium azide (CAS NO.26628-22-8) is:

Product Name: Sodium azide
CAS Registry Number: 26628-22-8
IUPAC Name: Sodium azide
Molecular Weight: 65.00987 [g/mol]
Molecular Formula: N₃Na
H-Bond Donor: 0
H-Bond Acceptor: 2 
EINECS: 247-852-1
Density: 1.846
Melting point: 275 °C
Boiling point: 300 °C(dec.)
Water solubility: 420 g/L (17 °C)
Flash Point: 300 °C
Sensitive: Air & Moisture Sensitive
Stability: Unstable. Avoid heat, sources of ignition, moisture, shock, friction. Incompatible with strong oxidizing agents, mineral acids, water, halogen acids and halogen compounds, barium carbonate, bromine, carbon disulphide, mercury, dimethyl sulphate, common metals, especially brass, copper, lead, silver, strong acids.
Product Categories: Sodium azide;Inorganics;Classes of Metal Compounds;Na (Sodium) Compounds (excluding simple sodium salts);Typical Metal Compounds;Azidation/Diazo TransferChemical Ligation;Azide SourcesMetal and Ceramic Science;Click Chemistry;Salts;Sodium Salts;Superoxide dismutase;R to;Azidation/Diazo Transfer;C-X Bond Formation (Non-Halogen);Synthetic Reagents;Azidation/Diazo TransferEnzyme Inhibitors by Enzyme;Peroxidase Inhibitors;P to;Azidation/Diazo TransferPesticides&Metabolites;Herbicides

 Sodium azide (CAS NO.26628-22-8) is a useful probe reagent, mutagen, and preservative. It is used in organic synthesis to introduce the azide functional group by displacement of a primary halide.Also it is used for the preparation of other azide compounds.And it can beused in automobile airbags and airplane escape chutes, Organic synthesis and Inorganic synthesis.It has a use in biochemistry and biomedical.

The common synthesis method is the "Wislicenus process," which proceeds in two steps from ammonia. 
          2 Na + 2 NH₃ → 2 NaNH₂ + H₂
The Sodium azide (CAS NO.26628-22-8) is subsequently combined with nitrous oxide:
          2 NaNH₂ + N₂O → NaN₃ + NaOH + NH₃

Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program. EPA Extremely Hazardous Substances List.

Poison by ingestion, skin contact, intraperitoneal, intravenous, and subcutaneous routes. Human systemic effects by ingestion: general anesthesia, somnolence, and kidney changes. Questionable carcinogen with experimental tumorigenic data. Human mutation data reported.
Violent reaction with benzoyl chloride combined with KOH, Br₂, barium carbonate, CS₂, Cr(OCl)₂, Cu, Pb, HNO₃, BaCO₃, H₂SO₄, hot water, (CH₃)₂SO₄, dibromomalononitrile, sulfuric acid. Incompatible with acids, ammonium chloride + trichloroacetonitrile, phosgene, cyanuric chloride, 2,5-dinitro-3-methylbenzoic acid + oleum, trifluroroacryloyl chloride. Reacts with heavy metals (e.g., brass, copper, lead) to form dangerously explosive heavy metal azides, a particular problem in laboratory equipment and drain traps. When heated to decomposition it emits very toxic fumes of NO_x and Na₂O. See also AZIDES. 
Hazard Codes: Xn, T, N, T+
Risk Statements: 28-32-50/53-52/53-22 
R28:Very toxic if swallowed. 
R32:Contact with acid liberates very toxic gas. 
R50/53:Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R22:Harmful if swallowed.
Safety Statements: 61-60-45-28A-28
 S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S60:This material and its container must be disposed of as hazardous waste. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S28:After contact with skin, wash immediately with plenty of soap-suds.
RIDADR: UN 1687 6.1/PG 2
WGK Germany: 2
RTECS: VY8050000
HazardClass: 6.1
PackingGroup: II

 Sodium azide , its cas register number is 26628-22-8. It also can be called Azide, sodium ; Azoture de sodium ; Azydek sodu ; Hydrazoic acid, sodium salt ;  Natriumazid ; Nemazyd ; Smite .It is a colorless crystalline solid. It can burns in air and may explode if large quantities are involved. It is toxic by ingestion. It soluble in water. Its dust may form an explosive mixture in air. It is unstable and may explode if shocked. It can cause death by affecting the central nervous system. Contact may cause burns to skin and eyes. It is extremely toxic.