Why did they write island of elements at the bottom of the chart instead of placing them where they belong on the periodic table of elements?

What is the direction of the net force on the earth? What are fairly steep-sided cones composed of lavas and pyroclastic layers? What are the defects of the gastrointestinal tract? What is the volume of Popocatepetl? What is the value of a pencrest console solid state record player? What do pathogens cause? In order to construct a topographic map of your area you would have to collect certain dataWhat is this data and would you use the to make acontour map? Which metal is most similar to copper and why? Where can rhyolite be found? Will an objects weight affect whether or not it is attracted to the magnet? Regulates what enters and exits the cell? In the fictional map which elements suggest relative location? Will a black hole ever stop consuming things? Neptune takes how much time to complete one revolution around sun? What best describes what happens when the ATP synthase molecule opens? Is the nucleus a heterotroph or autotroph? What will conduct a nerve impulse faster thick or thin axon? What creates winds in the atmosphere and therefore currents in the ocean? What does easy to snow mean? What way the earth's core spins is believed to be the source of?