Magnesio is magnesium in Spanish. We cut out a small figure in magnesium metal and stuck a little manganese (IV) oxide to its arms and head using Superglue.
We then dropped the figure into a luminol reaction mixture set-up in a measuring cylinder containing layers of sucrose solutions as described in March 2015. It needed a little prodding with a glass rod to get it to submerge at first, but then started bobbing up and down as shown in the animated .gifs below.
The bottom layer of sucrose solution solution contained some 4M hydrochloric acid so that when the magnesium sank down that far, it reacted with the acid producing bubbles of hydrogen, causing it to float up again.
When the magnesium rose up into the topmost layer, which was 0.5M iron (III) chloride, it probably got coated with the dark green iron containing precipitate formed there, which may have helped it to sink again.
The middle of the measuring cylinder contained the luminol reaction mixture, (potassium hydroxide, luminol and 6% hydrogen peroxide solution).
Finally, when the luminol reaction was over, Magnesio was washed out into the sink.
Maybe you will be able to see a Magnesio adventure soon.
See the movie file on You Tube
The three metals attracted to the neodymium magnet last time were nickel, cobalt and iron.