What is a property of most metals? a. they tend to gain electrons easily when bonding. b. they tend to lose electrons easily when bonding. c. they are poor conductors of heat. d. they are poor conductors of electricity?

Metals generally have one, two or three valence electrons (versus non-metal that usually have five, six, seven or eight).  As a result, it is easier (requires less energy) for a metal to lose it's valence electrons that it is to gain in excess of 3 electrons in order to become stable.  

Thus the answer is, they tend to lose electrons easily when bonding [OPTION B].

Note; metals, because of their sea of electrons, are good conductors of both heat and electricity.