Question

reacting strongly with other elements, ____ explode easily. alkali metals semiconductors transition metals noble gases

Explanation:

Alkali metals are highly reactive and can react violently with water and other substances, sometimes leading to explosions. Semiconductors are mainly used in electronics and have different chemical - reactivity characteristics. Transition metals are less reactive than alkali metals in general. Noble gases are inert and do not react easily.

Answer:

A. alkali metals