- Physical Sciences
two or more different forms or structures of the same element.
the ratio of the amount of a pure compound to the amount of substance containing that compound...
the scale used to compare the masses of atoms. Atoms are compared to carbon-12 atoms.
100 000 N per square metre. A pressure of 1 N Â· m2 is called one pascal (Pa).
four shared electrons, or two shared pairs of electrons (or two covalent bonds) between the same...