The relative atomic mass of an element is:
a. the mass of its atoms compared to the mass of a carbon-12 atom.
b. the mass of only the neutrons in the atom's nucleus.
c. the mass of its isotopes compared to the mass of a normal atom.
d. the mass of its atoms averaged over time.

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.

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.