Can someone help me arrange this from least dense to densest

A. Silicates of metallic compound

B. Iron and nickel

C. Silicon aluminum

D. Iron and magnesium

E. Iron-rich metal alloy

F. Silicon, iron, and magnesium

Concerning the 10.0 ml of 0.50 m nacl to 100 ml of solution: when a solution is diluted, does it change the number of moles dissolved?

Equal numbers of moles of he(g), ar(g), and ne(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixture has effused?

An atom of element x has one more shell of electrons than an atom of beryllium, but it has one less valance electron than beryllium. which element is x