1. The chemical properties of zinc are active. In the air, a thin and dense basic zinc carbonate film forms on the surface at room temperature, which prevents further oxidation. When the temperature reaches 225 °C, the zinc oxidation is intense. When it burns, it emits a teal flame. 2. Zinc wire made of 99.995% purity zinc has a long service life and is strong and durable. Atomic radius (calculated) 135 (142) pm, covalent radius 131 pm. 3. The melting point of zinc is 419.5 °C. At room temperature, it is brittle; at 100 150°C, it becomes soft; if it exceeds 200°C, it becomes brittle again. 4. It is suitable for the materials of instrument parts, instrument housings, and coins. At the same time, zinc itself and other metals do not produce sparks, making it suitable for underground explosionproof devices. It is widely used in rubber, paint, enamel, medicine, printing, fiber, and other industries. Zinc has suitable chemical properties.