Your doctor may need to change the doses of your medications or monitor you carefully for side effects. ... Metformin side effects can also affect other parts of the body. It can leave a metallic taste in the mouth, cause heartburn or headache, flushing of the skin, nail changes or muscle pain. More serious metformin side effects include chest pain or rash. ...
Early String Theory. The first attempt to construct a physical model of an atom was made by William Thomson (later elevated to Lord Kelvin) in 1867. The most striking property of the atom was its permanence.
In 1913, Neils Bohr, a student of. 's, developed a new model of the atom. He proposed that electrons are arranged in concentric circular orbits around the nucleus. This model is patterned on the solar system and is known as the planetary model.n 1926 Erwin Schroedinger, schrÃ¶dinger An austrian, physicist took The bohr atom model one step. Further schroedinger schrÃ¶dinger used mathematical equations to describe the likelihood of finding an electron in a. Certain position this atomic model is known as the quantum mechanical model of. the atom