Early in the 20th century scientists realised that all matter is made up of atoms. As a result of an experiment carried out by his assistants, Hans Geiger and Ernest Marsden, Ernest Rutherford suggested a model for the atom. The experiment is known as Rutherford's alpha particle scattering experiment.
<span>when the number of moles Ca = mass of Ca / molar mass of Ca.
and we can get the molar mass of Ca, it is = 40 g/mol
and we have already the mass of Ca (given) = 9.8 g
so, by substitution: the moles Ca = 9.8 g / 40 g/mol
= 0.245 moles</span>
Solids- their particles are more compressed to each other.
liquids- their particles are not so much compressed together but more as slightly compressed and they move more frequently.
gases - their particles are spread out and are not compressed to each other.
Um not sure... is this a trick question?