Meningioma; Synonyms: Meningeal tumor: A contrast-enhanced CT scan of the brain, demonstrating the appearance of a meningioma: Specialty: Neurosurgery: Symptoms: None, seizures, dementia, trouble talking, vision problems, one sided weakness: Usual onset: Adults: Types: Grade I, II, III: Risk factors: Ionizing radiation, family history: Diagnostic method
A polar covalent bond shares electrons unequally. Because of this unequal sharing, one end of the molecule is slightly positive, and the other end slightly negative. Edit
In the case of covalent bonds, electrons are neither lost nor gained. No ions are formed. Instead, the electrons are shared. This group of atoms must have watched Sesame Street as a kid. Covalent bonding is the sharing of one or more pairs of electrons between nonmetals. Covalent bonds in a molecule are often depicted as a dash. The dash represents the two electrons shared between the atoms. The atoms can have a: