For a noble gas atom is it possible to have covalent radius? Explain.

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

Is it possible to liquefy a gas at any condition?

Name the noble gas that forms majority of the known noble gas compounds.

Why is it not possible to see an atom with naked eyes?

If a person stands near a fast moving train, there is a possibility of his falling-- explain.

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

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

What will be the electric field strength at the surface of a gold atom? Assume that charge on an atom is distributed uniformly in a sphere of radius 10^-10 metre (z for gold = 79).

Can a trapezium have all angles equal? Can it have all sides equal? Explain.

Why is geometrical isomerism not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion?