Because few minerals contain it in large concentration, Germanium (CAS NO.7440-56-4) was discovered comparatively late despite the fact that it is relatively abundant in the Earth's crust. In 1869, Dmitri Mendeleev predicted its existence and some of its properties based on its position on his periodic table and called the element ekasilicon. Nearly two decades later, in 1886, Clemens Winkler found it in the mineral argyrodite. Winkler found that experimental observations agreed with Mendeleev's predictions and named the element after his country, Germany.

Reported in EPA TSCA Inventory.

The Germanium, with the cas registry number 7440-56-4, is a kind of greyish-white lustrous brittle solid with no odour. This chemical is stable and is slightly soluble in strong acids while incompatible with strong oxidizing agents. Besides, its product categories are including Germanium; Metal and Ceramic Science; Metals. When comes to its usage, it is usually applied in producing semiconductor devices.

The characteristics of this chemical are as follows: (1)#H bond acceptors: 0; (2)#H bond donors: 0; (3)#Freely Rotating Bonds: 0; (4)Polar Surface Area: 0; (5)Exact Mass: 73.921178; (6)MonoIsotopic Mass: 73.921178; (7)Heavy Atom Count: 1; (8)Covalently-Bonded Unit Count: 1.

When you are dealing with this chemical, you should be very cautious. For one thing, it is irritating to eyes, respiratory system and skin and may cause inflammation to the skin or other mucous membranes. For another thing, it is highly flammable which may catch fire in contact with air, only needing brief contact with an ignition source, and it has a very low flash point or evolve highly flammable gases in contact with water. Therefore, you should wear suitable protective clothing and eye/face protection and if in case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Then remember to keep it out of the reach of children.

In addition, you could convert the following datas into the molecular structure:
(1)Canonical SMILES: [Ge]
(2)InChI: InChI=1S/Ge
(3)InChIKey: GNPVGFCGXDBREM-UHFFFAOYSA-N 
 
Below are the toxicity information of this chemical: