Adding a proton to an atom makes a new element, while adding a neutron makes an isotope, or heavier version, of that atom. Nucleus. The nucleus was discovered in 1911 by Ernest Rutherford, a physicist from New Zealand, who in 1920 proposed the name proton for the positively charged particles of the atom.
Dirty snow (water + dirt) Ocean water (water + salt) Alloy Mixtures. While virtually any two items combined together, that can then be taken back apart through some physical means, can be a mixture, some of the most important mixtures are strong metals called alloys. These special metals are a mixture of two metals that are combined together to strengthen them.