Oxygen is an essential element for all life forms on Earth. Its atomic number is:​

Correct option is D

The correct answer is: (d) 8

Explanation:

The atomic number of oxygen is 8, meaning it has 8 protons in its nucleus. Oxygen is a vital element for respiration in most life forms on Earth and is part of the chalcogen group in the periodic table. Its molecular form (O₂) is essential for the survival of many organisms, including humans.

Information Booster:

• Oxygen (O) is the third most abundant element in the universe.

• It is a colorless, odorless, and tasteless gas that is vital for most living organisms.

• Oxygen is involved in processes like cellular respiration, combustion, and oxidation reactions.

• The symbol for oxygen is O, and it forms essential compounds like water (H₂O) and carbon dioxide (CO₂).

• It is highly reactive and supports the combustion of fuels.

• The atomic number 8 makes it part of the second period of the periodic table.