Draw a six-carbon-chain portion from isotactic polypropylene, in which all of the CH3 groups point in the same direction, that is, either all behind or all in front of the plane of the computer screen. X represents the continuation of the polymer chain. Do not add any bonds to X.

Six-carbon-chain

Explanation:

Diagram is illustrated in the attach document.

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.