Group 18, the noble gases, are elements that hardly react with other elements. This is because they have their full complement of eight valence electrons.
Group 16 on the Periodic Table, also known as the chalcogens, contains elements that react with oxygen to form compounds with the general formula X2O. The elements in this group include oxygen, sulfur, selenium, tellurium, and polonium.
elements are in the same group since they react similarly to other elements in that group.
All of them tend not to react with each other until you get lower down the group
The modern model explains why most elements react with other elements while a few elements hardly react at all.
Noble Gases
Group-18 elements least react with other elements. They are inert in nature. They are called noble gases.Elements in group 18 are less likely to react with any other elements. This group is made out of the noble gases. Its members are He, Ne, Ar, Kr, Xe and Rn.
Noble gases or group 18 elements
Noble gases, located in Group 18 of the periodic table, are known for their stability and do not readily react with other elements to form compounds. They have full outer electron shells, making them chemically inert.
Group 17 elements, also known as the halogens, are the p block elements that react to form halides. They readily react with other elements to form salts called halides, such as sodium chloride (NaCl) and potassium iodide (KI).
Potassium is a metal, and it would react to group 17 (7A) because those elements are nonmetals.
The alkali metals in group 1 react by losing one electron.
Potassium would strongly react with the elements in group 17 and group 16.