Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). They can exist as single cells, in pairs, chains or clusters. Bacteria are found in every habitat on Earth: soil, rock, oceans and even arctic snow.
Arsenic is natural element widely distributed in the earth's crust.
There are two forms of arsenic organic and inorganic.
Symbol: As
Electron configuration: [Ar] 3d¹⁰4s²4p³
Atomic number: 33
Atomic mass: 74.9216 u
Electronegativity: 2.18
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The most widely effective solvent for organisms is a material that is nonpolar. This is because most of the molecules present in organisms are nonpolar so it would only dissolve in nonpolar solvents like lipids, DNA, proteins, amino acids and fats. Nonpolar molecules would share their electrons equally resulting to having no partial charges in the molecule. The electronegativities are cancelled by each atom. Examples of this are most of the organic compounds like benzene and hexane, carbon tetrachloride is also a nonpolar molecule. To identify whether the molecule is nonpolar or polar, you need to look at the structure and the electronegativities of the atoms.
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