The correct answer is A: neon, helium, argon.

Here's why:

A. Neon, helium, and argon are all noble gases, which are monatomic and non-metallic. They exist as individual atoms in their gaseous state.

B. Hydrogen, oxygen, and nitrogen are all non-metals, but oxygen and nitrogen are diatomic, not monatomic, in their gaseous state.

C. Neon and helium are monatomic non-metals, but oxygen is diatomic in its gaseous state.

D. Sulfur, phosphorus, and carbon are all non-metals, but they do not exist as monatomic gases.

Question

The correct answer is A: neon, helium, argon.

Here's why:

A. Neon, helium, and argon are all noble gases, which are monatomic and non-metallic. They exist as individual atoms in their gaseous state.

B. Hydrogen, oxygen, and nitrogen are all non-metals, but oxygen and nitrogen are diatomic, not monatomic, in their gaseous state.

C. Neon and helium are monatomic non-metals, but oxygen is diatomic in its gaseous state.

D. Sulfur, phosphorus, and carbon are all non-metals, but they do not exist as monatomic gases.

Knowee AI · Accepted Answer

The correct answer is A: neon, helium, argon.

Here's why:

A. Neon, helium, and argon are all noble gases, which are monatomic and non-metallic. They exist as individual atoms in their gaseous state.

B. Hydrogen, oxygen, and nitrogen are all non-metals, but oxygen and nitrogen are diatomic, not monatomic, in their gaseous state.

C. Neon and helium are monatomic non-metals, but oxygen is diatomic in its gaseous state.

D. Sulfur, phosphorus, and carbon are all non-metals, but they do not exist as monatomic gases.

Which of the following is a list of gaseous monatomic non-metals?Aneon, helium, argonBhydrogen, oxygen, nitrogenCneon, helium, oxygen Dsulfur, phosphorus, carbon