Could a mixture be made up of only elements and no compounds?

Which is true of transition metals when moving from left to right on the periodic table? the d sublevels are not filled across the period. the cation radii become larger across the period. atomic radii increase slightly and then start to decrease. atomic radii decrease slightly and then start to increase. o

What is the density of the black hole

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a