Which of the following metals having atomic number 3 is a soft, silvery metal with very low density that reacts vigorously with water and corrodes quickly in the air?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Lithium.
- Lithium is a soft, silvery metal, with a very low density, which reacts vigorously with water, and quickly tarnishes in air.
- Lithium is an alkali metal with an atomic number = 3 and an atomic mass of 6.941 g/mol.
- Being an alkali metal, lithium is a soft, flammable, and highly reactive metal that tends to form hydroxides.