1. Symbol: Mn

Atomic Number: 25

Atomic Weight: 54.938045

Melting Point: 1,246 °C (2,275 °F)

Boiling Point: 2,066 °C (3,747 °F)

Density: 7.21 g/cm³ (at 20 °C)

2. Discovery:**

Manganese was first isolated in 1774 by the Swedish chemist Johan Gottlieb Gahn.

3. Abundance:

Manganese is the 12th most abundant element in the Earth's crust, with an average concentration of about 1,000 ppm.

4. Color:

Manganese is a hard, brittle, silver-white metal with a pinkish cast.

5. Reactivity:

Manganese is reactive and readily forms alloys with other metals, such as iron, copper, and aluminum.

6. Oxidation States:

Manganese exhibits a wide range of oxidation states, from -3 to +7, with +2 and +4 being the most common.

7. Minerals:

Manganese is primarily obtained from manganese ores, such as pyrolusite (MnO2) and manganite (MnOOH).

8. Major Uses:**

Manganese is primarily used in the production of steel, where it acts as an alloying agent to increase strength and hardness. It is also used in the manufacture of dry-cell batteries, glass, ceramics, and fertilizers.

9. Biological Role:**

Manganese is an essential trace mineral for humans and animals. It plays important roles in bone formation, metabolism, and antioxidant defense systems.

10. Health Effects:**

Manganese is generally safe at low levels, but high levels of exposure to manganese dust or fumes can cause a neurological condition called manganism, which can lead to tremors, muscle stiffness, and cognitive impairments.

11. Environmental Impact:**

Manganese mining and processing can release manganese into the environment, potentially contaminating soil, water, and plants. High levels of manganese in the environment can be toxic to aquatic organisms and can also pose risks to human health.