Question

Which one of the following element is not included Ina group

Answer 1

Answer:

again, I am asking sir where are the options

• however hydrogen is the only element which is not included in any group or period because it shows the properties of both first group elements and 17 group elements

Answer 2

Hydrogen is the one and only element which was not added in a group.

Element excluded from a group

• Hydrogen is a Colorless, non-poisonous, non-smelling and also flavorless gas under normal temperature and pressure.
• It has one electron and one proton which makes it to possess  entirely different physical and chemical properties.
• That is, it doesn't have any properties common to other elements in the whole periodic table.
• So it was not added in any of the groups in the Periodic table.