Percent composition of potassium in K20?

"the periodic table is arranged in order of atomic number."

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

pie chart because it is in percents ( % )