Amtrak provides service along the Northeast Corridor, and the city is a hub for Greyhound. More than 25 airlines serve Philadelphia International Airport, including low-cost carrier Southwest.
LINK / CITE ADD TO WORD LIST. noun. The definition of ionic bond is when a positively charged ion forms a bond with a negatively charged ions and one atom transfers electrons to another. An example of an ionic bond is the chemical compound Sodium Chloride.
A covalent bond is a chemical bond between two nonmetals (two metals cannot covalently bond) in which electrons are shared, while an ionic bond is a chemical bond between a me â¦ tal and a non metal due to the attraction between oppositely charged ions. 13 people found this useful.