An element has the following natural abundances and isotopic masses: 90.47% abundance with 19.98 amu, 0.28% abundance with 20.98 amu, and 9.26% abundance with 22.00 amu. Calculate the average atomic mass of this element. (Enter an unrounded value.)

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.