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The main group elements are groups 1, 2, and 13 - 18.
Groups 1, 2, and 13 - 18 are the main group elements, also called the representative elements.
The representative, or main group elements are the elements in groups 1, 2, and 13 - 18.
Compounds result from combining 2 or more elements chemically.
2
The antarctic treaty, which now has 46 nations in it, has 2 main organisations that deal with whaling. Although the treaty do address the Japanese whaling, the main 2 organisations are Greenpeace and Sea Sheperd. These 2 organisations aim to fight the whaling in Antarctica going to many extents. Sorry I didn't help but if you can get your hands on a book name "Oxford Big Ideas Humanities 2" it has a whole chapter on Antarctica and also about the treaty.
Hydrogen and helium.
There are eight groups that make up the main group elements. They are groups 1, 2, and 13 - 18. They are also called the representative elements.
3d-block elements or tranformation elements and 4f-block elements or lanthanides and actinides
Main group elements have elements from groups 1 and 2, except hydrogen and groups 13 to 18. Main group elements are elements in groups who's lightest elements are shown by helium, lithium, boron, beryllium, carbon, nitrogen, oxygen, and fluorine.
A system of connected elements such as rail lines is a type of bond. This is to connect the 2 main route.