Question

4. Which elements are found in the gaseous state in the form of monoatomic structure at room temperature?​

Answer 1

Ответ:

The only chemical elements that are stable single atom molecules at standard temperature and pressure (STP) are the noble gases. These are helium, neon, argon, krypton, xenon, and radon.

Answer 2

At room temperature (around 25°C or 77°F), only noble gases exist in the gaseous state in the form of monoatomic (single-atom) structures. These noble gases include:

1. Helium (He)
2. Neon (Ne)
3. Argon (Ar)
4. Krypton (Kr)
5. Xenon (Xe)
6. Radon (Rn)

These elements are in Group 18 (VIII A) of the periodic table and have a full complement of electrons in their outermost electron shells, making them highly stable and unreactive with other elements. As a result, they exist as individual atoms (monoatomic) in their elemental form at room temperature and normal pressure.