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Which group in the periodic table of elements contains the most elements? Group 1The first vertical column or group, Group 1, the alkali metals, has the most elements in it (7, if hydrogen is included). 14, 15, 16. 18. Periodic table columns 13, 14, and 15. 3rd B or 3rd group. Noble Gases, Group 18. halogens & noble gases. Group III-B or 4th, it includes 4 elements of 'd' block and all the 28 elements of 'f' block.
The transition metals are found in groups 3 through 12. You may notice that we are leaving out that 'island' of elements down below. The top row of that island makes up the lanthanides and the bottom row makes up the actinides. We are leaving these out because they are neither main group elements nor transition metals. Main Group Elements. The main group elements are by far the most abundant elements - not only on Earth, but in the entire universe. For this reason, they are sometimes called the 'representative elements.' The main group elements are found in the s- and p-blocks, meaning that their electron configurations are going to end in s or p. Remember the s- and p-blocks are responsible for providing the valence electrons, those super-important electrons that are involved in chemical bonding. Both the electron configurations and the number of valence electrons are very predictable as we move across the main group elements. Group 1 has elements with one valence electron, group 2 has elements with two, group 13 has elements with three valence electrons and so on to group 18, with eight valence electrons.