18.5 x avrogrados number

1.11407×10^25

Explanation:

18.5 x 6.022*10^23= 1.11407×10^25

      (Avogadro's 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.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).