We all know that helium is a noble gas. It has atomic number 2 but it is placed in 18 group be because in 1st group the elements have only one electron in thier s orbital e.g. Hydrogen, lithium, sodium, potassium etc. But helium has two electron so it cannot exist in 1 group. In second group the s orbital are same but the physical and properties of helium is different from the elements present in second group. According to modern Periodic Table elements which have same physical properties are placed in same group. Since helium is an inert gas and its physical properties are similar to the other elements of the 18 group and also helium discoverd late so that hilium can be put in the 18 group
Helium is located on the group 18 and period 1 on the modern periodic table.
Helium is in Group 18 (also known as the noble gases) and in the top row of the periodic table.
It is in group 18 of the periodic table
Group 18
It is a noble gas - group 18.
Helium is the lightest member in group 18.
Helium (He) in a noble or inert gas, and it is in Group 18 of the periodic table.
Helium is a noble gas and is located in the group 18 of the periodic table.
Helium is the lightest member in group 18.
Group 18, starting with Helium
Group 18 on the Periodic Table contains the Inert Gases. Inert Gases tend to be unreactive. This group has the elements Helium, Neon, Argon, Krypton, Xenon, and Radon.
Helium is placed at the top of the group-18 in periodic table. Its valence shell contains 2 electrons. It is inert in nature like other elements of group-18.