They occur in two oxidation states, +2 and +4. Silicon and germanium share similar physical and chemical characteristics, since both are metalloids. Silicon. Silicon is the element with atomic number 14, and it is in the group 14 of the periodic table, just below carbon.
A paresthesia is an abnormal sensation of tingling, numbness, or burning. Paresthesias are usually felt in the hands, feet, arms, or legs, but can be felt anywhere. The sensation is usually unpleasant.
It may be a pathological condition if it happens spontaneously, or it may be induced to facilitate surgery or some other medical treatment. Hyperesthesia is an abnormal acuteness to sensation--an increased sensitivity. Paresthesia is an abnormal spontaneous sensation such as tingling, prickling, or burning. Neuralgia consists of severe spasms of throbbing or stabbing pain along the pathway of a nerve. Two types of neuralgia are described below.