Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Helium is categorised as a special element. Specify the category and also the reason for placing them separately.

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Helium comes under a category called noble gases. [1 mark]
Noble gases are a group of elements which do not react with any other elements. That is reason for them to be placed separately. [1 mark]
They are also called as inert gases. [0.5 marks]
Helium, neon, and argon are a few examples of noble gases [0.5 marks]