Final answer:
The Main Group Elements or Representative Elements consist of the elements in groups 1 and 2, and groups 13 to 18 on the periodic table, excluding the noble gases of group 18 if considered separately.
Step-by-step explanation:
The main group elements, also known as the representative elements, are found in the columns labeled 1, 2, and 13-18 on the periodic table. These elements can further be categorized based on specific properties such as the composition of the compounds they form. For example, the elements in group 1 are known as alkali metals and the ones in group 2 are known as alkaline earth metals. Notable other group names are the pnictogens (group 15), chalcogens (group 16), halogens (group 17), and the noble gases (group 18).
In contrast, the transition metals are located in columns 3-12. The inner transition metals comprise the two rows at the bottom of the periodic table and are subdivided into the lanthanides and the actinides. Therefore, the correct answer to the question 'What are the Main Group Elements (Representative Elements)?' is groups 1 and 2, and groups 13 to 18. This excludes group 18, the noble gases, when considering them separately for their distinctive inert characteristics.