Choose which is different or odd in the following. A. argon B. neon C. xenon D. hydrogen

The answer is D. Hydrogen.

Argon, neon, and xenon are all noble gases. Noble gases are elements that have a full valence shell, which means that they are very stable and do not react easily with other elements. Hydrogen, on the other hand, is a non-metal that has a single electron in its valence shell. This makes it very reactive and prone to bonding with other elements.

Here is a more detailed explanation of each option:

• Argon is a noble gas with the symbol Ar and atomic number 18. It is a colorless, odorless, and tasteless gas that is found in the Earth’s atmosphere. Argon is used in a variety of applications, including lighting, welding, and cryogenics.
• Neon is a noble gas with the symbol Ne and atomic number 10. It is a colorless, odorless, and tasteless gas that is found in the Earth’s atmosphere. Neon is used in a variety of applications, including lighting, signs, and lasers.
• Xenon is a noble gas with the symbol Xe and atomic number 54. It is a colorless, odorless, and tasteless gas that is found in the Earth’s atmosphere. Xenon is used in a variety of applications, including lighting, lasers, and medical imaging.
• Hydrogen is a non-metal with the symbol H and atomic number 1. It is the lightest element in the universe and is found in water, acids, and organic compounds. Hydrogen is used in a variety of applications, including fuel cells, rocket engines, and nuclear fusion.