Question

What element is in group $18$ Period $1$ .

Answer 1

Hint: We need to know the placement elements in the periodic table and accordingly find out which is the element placed in group $18$ period $1$ of the periodic table. The periodic table, commonly known as the periodic table of elements, is a tabular representation of chemical elements organised by atomic number, electron configuration, and recurrent chemical characteristics. The table's structure reveals periodic patterns. Metals are on the left and nonmetals are on the right in the table's seven rows, known as periods. The elements in the columns, referred to as groups, have comparable chemical properties.

Complete answer:
We have to know that a period $1$ element is a chemical element that belongs to the first row (or period) of the periodic table of chemical elements. The periodic table is organised in rows to show periodic (recurring) tendencies in the chemical behaviour of the elements as their atomic number increases: a new row is started when chemical behaviour begins to repeat, which means that analogue elements are grouped together vertically. Only two elements are found in the first period, compared to every other row in the table: hydrogen and helium. Hydrogen belongs to group $1$ whereas helium belongs to group $18$ .
Hence, the element of group $18$ Period $1$ is helium.

Note:
We must note that Helium, the other period $1$ element, is usually grouped with the other noble gases in group $18$ because of its amazing inertness, which is very similar to that of the other light noble gases neon and argon. Helium, the other period $1$ element, is usually grouped with the other noble gases in group $18$ because of its amazing inertness, which is very similar to that of the other light noble gases neon and argon.