Answer: The options are not given, here are the options.
1.Sulfur.
2. Mercury.
3. Copper.
4. Sodium.
5. Magnesium.
The correct answer is sodium.
Step-by-step explanation:
It is sodium because sodium is a chemical element with the symbol Na and it has atomic number 11. It is an akali metal, it is soft, slivery and does not occur free in nature.it is found in compound and group 1 on the periodic table. It is solid at room temperature. (ii) It easily forms an oxide when exposed to air. (iii) When it reacts with water, hydrogen gas evolves. (iv) It must be stored submerged in oil.