Which of the following is a monoatomic gas? A. Oxygen B. Neon C. Nitrogen D. Fluorine

The correct answer is B. Neon.

A monoatomic gas is a gas that is composed of atoms that are not bonded to each other. Neon is a noble gas, which means that it is very stable and does not react

with other elements. This is because neon has a full valence shell, which means that it has eight electrons in its outermost shell. This is the most stable configuration for an atom, and it is why noble gases are not reactive.

Oxygen, nitrogen, and fluorine are all diatomic gases, which means that they are composed of molecules that contain two atoms. Oxygen and nitrogen are both

elements that are essential for life, and fluorine is a highly reactive element that is used in a variety of industrial processes.

In conclusion, the correct answer is B. Neon. Neon is a monoatomic gas because it is composed of atoms that are not bonded to each other.