Correct Answer: Manganese

Solution : The correct answer is Manganese .

"Mn" stands for the chemical element manganese in the periodic table. Manganese is a transition metal with the atomic number 25. Manganese is found in abundance in the Earth's crust, usually in combination with iron. Its physical properties include:

• Manganese is a hard, brittle, grey-white metal.
• It has a relatively high melting point (1,246 degrees Celsius or 2,275 degrees Fahrenheit).
• Manganese is a solid at room temperature.