What types of elements undergo ionic bonding? select one: a. two metals b. a nonmetal and a metal c. two nonmetals d. two group 1a elements e. two noble gases?

Ionic bonds are made up of elements with positive charges and a negative charges. Example: magnesium oxide (MgO). 
 Usually nonmetals are negative charged and metals are positive charged. therefore A NONMETAL AND A METAL is the only answer that matches the explanation. 

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True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"