Which statement about mixtures and solutions is incorrect?
a) some mixtures are solutions.
b) all solutions are mixtures.
c) no solutions are mixtures.
d) mixtures and solutions are always the same thing.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

it is stable as it is in group 0 which have full outer shells of electrons