The melting point of metallic zinc is 419.53°C. Zinc is difficult to burn in the air and emits strong white light in oxygen.

The melting point of titanium metal is 1668±4°C. It is not easy to burn in air and oxygen. However, titanium cannot be used in dry chlorine. Even dry chlorine with a temperature below 0°C will undergo violent chemical reactions. Generate titanium tetrachloride, then decompose to generate titanium dichloride, and even burn.

Metal magnesium has a melting point of 648°C and can produce dazzling white light when burned in air.

Metal iron has a melting point of 1535°C and is difficult to burn in air, but it burns in oxygen to form Fe3O4.

In summary, metallic magnesium can burn in air;

Metal iron and metallic zinc can burn in oxygen;

Metal titanium can burn in chlorine .