An unknown element, X, reacts with oxygen to form two oxides with the general formula X2O3 and X2O5. The pure element is strongly paramagnetic, and the oxides are amphoteric. Which of the following elements could be represented by X: , Sc, Bi, N, Sb, S? Explain your choice.

What happens to energy in an open system?

How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.