Groups 1 and 17.
Alkaline Earth metals
the periodic table
Group 17 or halogens will combine readily with group 1 elements.
Group 1 elements (such as Sodium and Potassium) readily form compounds because they are highly reactive metals that readily lose their outer electron to form positive ions. Group 7 elements (such as Chlorine and Fluorine) are highly reactive nonmetals that readily gain an electron to form negative ions, making them prone to forming compounds as well.
Barium can form compounds with many elements, including oxygen, sulfur, and halogens like chlorine. Barium also readily combines with metals such as aluminum or magnesium to form alloys. However, some combinations with specific elements may not be stable or practical.
Alkaline Earth metals
sodium
Yes, hydrogen is reactive because it readily combines with other elements to form compounds.
Oxygen is the most reactive gas in the atmosphere. It readily combines with other elements and compounds to form oxides.
the periodic table
Calcium
Group 17 or halogens will combine readily with group 1 elements.
Together with bromine and fluorine they belong to the 'halogenes', group 7 in the periodic table.
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.
The halogens are a group of elements in the periodic table that includes fluorine, chlorine, bromine, iodine, and astatine. They are highly reactive nonmetals that readily form compounds with other elements.
reactive
Elements in Group 2 of the periodic table, such as calcium, magnesium, and strontium, typically have a charge of 2 when forming ionic compounds. This is because they readily lose two electrons to achieve a stable electron configuration.