Bromine
The elements in group one are the alkali metals.
Group 1 on the periodic table consists of alkali metals. These elements are highly reactive and have one electron in their outer shell. The group includes elements like sodium, lithium, and potassium.
In the periodic table, group indicates the number of valence electrons in the outermost shell. E.g. Group I- the elements in that group have one valence electron in the outermost shell.
Elements in Group 1 of the periodic table are called alkali metals. This group includes elements such as lithium, sodium, and potassium. They are highly reactive metals that readily form ionic compounds.
Hydrogen is period 1 and group1 element. It has only one electron.
The halogens group is a group of nonmetal elements in the periodic table that includes fluorine, chlorine, bromine, iodine, and astatine. These elements are highly reactive and can form salts by gaining one electron to achieve a full outer shell. They are located in Group 17 of the periodic table.
Group 1 elements are alkali metals. Group-18 elements are inert in nature.
Metals are a group of elements in the Periodic Table. Aluminium is one of the elements.
Halogens these are the salt forming elements which are highly reactive
They all have one valence electron.
Lithium (Li) which is number 3
The "Periodic Table of Elements" is used for classifying the elements, and to know which one is which.