Chemistry informtion about Caesium Hydroxide (CAS NO.21351-79-1) is:
IUPAC Name: Cesium Hydroxide
Synonyms: Caesium Hydoxide ; Caesiumhydroxide,Solution ; Cesium Hydroxide (Cs(Oh)) ; Cesium Hydroxide Dimer ; Cesiumhydroxide(Cs(Oh)) ; Cesiumhydroxidedimer ; Csoh ; Cesium Hydroxide, 99.9% Metals Basis, 50 Wt. % Solution In Water
MF: CsHO
MW: 149.91
EINECS: 244-344-1
Density:3.68 g/mL at 25 °C(lit.) 
Melting Point: 272 °C(lit.)
Boiling Point: 100 °C at 760 mmHg
Vapour Pressure: 24.5 mmHg at 25°C
Enthalpy of Vaporization: 40.65 kJ/mol
Sensitive: Air Sensitive
Merck: 13,2022
Stability: Stable. Incompatible with acids. Absorbs carbon dioxide from the air.
Product Categories: Cesium SaltsChemical Synthesis ; Inorganic Bases ; Metal and Ceramic Science ; Salts ; Synthetic Reagents
Following is the molecular structure of Caesium Hydroxide (CAS NO.21351-79-1) is:

Caesium Hydroxide (CAS NO.21351-79-1) is used in electric storage batteries.Also, it is used in storage-battery electrolytes.However, it is not usually used in experiments as the extraction of caesium is very expensive and the fact that it behaves very much like rubidium hydroxide and potassium hydroxide but reacts chemically stronger than they do.

Reported in EPA TSCA Inventory.

Poison by intraperitoneal route. Moderately toxic by ingestion. A powerful caustic. A corrosive skin and eye irritant. See also CESIUM.
Hazard Codes:
C 
Risk Statements:
R22:Harmful if swallowed.  
R35:Causes severe burns. 
R34:Causes burns. 
Safety Statements:
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S37/39:Wear suitable gloves and eye/face protection. 
S27:Take off immediately all contaminated clothing. 
S28:After contact with skin, wash immediately with plenty of soap-suds.  
RIDADR: UN 2682 8/PG 2
WGK Germany: 3
F:
F 3: Hygroscopic.
HazardClass: 8
PackingGroup: II

OSHA PEL: TWA 2 mg/m³
ACGIH TLV: TWA 2 mg/m³
DOT Classification:  8; Label: Corrosive

 Caesium hydroxide can be obtained by the following chemical reaction:
2 Cs + 2 H₂O → 2 CsOH + H₂
The above reaction occurs explosively with enough force to shatter a Pyrex beaker. Caesium metal will react with ice above −116 °C.

 Caesium Hydroxide (CAS NO.21351-79-1) is a colorless to yellow crystalline solid, and it is an aqueous solution, strongly corrosive, it is harmful to skin and eyes. Dilution with water it may generate enough heat to cause steaming or spattering.
Reactivity Profile: Solution neutralizes acids exothermically to form salts plus water. Reacts with certain metals (such as aluminum and zinc) to form oxides or hydroxides of the metal and generate gaseous hydrogen. May initiate polymerization reactions in polymerizable organic compounds, especially epoxides. May generate flammable and/or toxic gases with ammonium salts, nitrides, halogenated organics, various metals, peroxides, and hydroperoxides. May serve as a catalyst. Reacts when heated above about 84°C with aqueous solutions of reducing sugars other than sucrose, to evolve toxic levels of carbon monoxide [Bretherick, 5th Ed., 1995].
Health Hazard: Toxic; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
Fire Hazard: Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas.