What is your reflection about scandium element?

Scandium is a soft, light, silvery-white metal, which becomes slightly tinged with yellow or pink when exposed to air. Scandium is almost as light (low density) as aluminum but it has a much higher melting point.

Explanation:

hope that helps:)

frequency or wavelenth of em radiation in a vacuum

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.