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Manganese 3A Yuen Wai Ki (25) Manganese is a transition metal. The state at room temperature and pressure is solid. Its atomic number (or number of protons) and number of neutrons are 25 and 30 respectively. Its relative atomic mass is 54.94. It is in the period 4. It is in silver-gray colour. It is hard and very brittle. It is difficult to melt, but easy to oxidize. It is used in iron and steel production. It is the key component of certain aluminum alloys and low-cost stainless steel. We produce a variety of important alloy by using manganese, for example, producing soft drinks cans. Manganese is disturbed in bones, liver, kidney, the pancreas in human bodies. It contains enzymes to metabolize carbohydrates, cholesterol, and amino acids.