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.
According to Dalton's Atomic theory atoms of one element can combine with atoms of another element to form compounds - new complex particles. In a given compound however the different types of atoms are always present in the same relative numbers. Dalton's atomic theory states that all matter is made of small particles called atoms. But he wrongly assumed that atoms cannot be divided. In the late nineteenth century, it was proved that atom can be further divided into three subatomic particles called electron, proton and neutron.