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
The more complex definition has to do with how the bond itself is formed. If electrons are shared equally or unequally between the two elements so that they form a bond with a shared pair of electrons this is a covalent bond. Now Ionic Bonds are a result of electron transfer and resulting electrostatic attraction.