Is it possible to have a polyhedron with any given number of faces?

Is it possible to have an elements with atomic number 1.5 placed between hydrogen and helium?

Is it possible to have a regular polygon with measure of each exterior angle as 22^@ ?

Is it possible to have a collision in which the whole of K.E is lost.

Is it possible to have length and velocity both as fundamental quantities? Why?

Is it possible to liquefy a gas at any condition?

Can a polyhedron have for its faces 3 triangles

Can a polyhedron have for its faces 4 triangles

Is it possible to have negative value in speed and displacement?

Is it possible for a given lens to act as a converging lens in one medium and a diverging lens in another medium?

Which of the following arguments are correct and which are not correct? Give reasons for your answer(ii) If a die is thrown, there are two possible outcome- an odd number or an even number. Therefore, the probability of getting an odd number is 1/2.