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.
Report Abuse. Covalent or ionic bonds. A covalent bond is when 2 or more atoms share electrons amongst themselves. An ionic bond is when ions of opposite charge are attracted, and thereby bound, to each other.