Which of the following is true of carbon?

Explanation:"Carbon can form single, double, or triple bonds with another carbon atom."

Carbon atoms has 6 electrons, therefore #1 is incorrect And carbon bonds usually increase the melting point of molecules. #2 is incorrect.

2b2t

explanation:

2b2t

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.