There are 86 metals known today, with gold being the first metal discovered. Aluminum is the most abundant metal on Earth. The science of metals and alloys is called metallurgy, which involves mixing metals and non-metals to form new substances called alloys. Metals can be shaped and formed through processes like forging, drawing, welding, bolting, and soldering, with common solders made of tin and lead and fluxes used to clean connections.