Two naturally occurring isotopes of aluminum exist, Al-26 and Al-27. Aluminum's atomic mass is -26.98 u. What can you conclude about the relative abundance of each isotope?

the answer is c. nacl

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.