How many moles of LiNO3 are required to produce 134.99 mol Li2SO4

In 2002, the rare earth elements mine in mountain pass, california was closed because

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

Which element would mostly likely have an electron affinity measuring closest to zero