After careful consideration your answer is...
Leucippus and Democritus
*Hope I helped*
~Alanna~
The melting of the ice cube indicates physical change has taken place
Elements are arranged by their atomic number, which is also the number of protons they have.
Given ,
Mass of sample of cobalt = 27 g
density of sample of cobalt = 9g/cm^3
We know that ,
Density = mass of sample/volume of sample
From that relation ,
We can deduce the following as
Volume = mass of sample/density of sample
Hence , required volume of sample of cobalt = 27 g /9 g/cm^3 = 3 cm^3
The volume is
Compound is formed when two or more atomic bond (or atom)