what is called a molecule having one atom in it?

Answer 1

Monatomic compounds are composed of single atoms and there are no chemical bonds between these atoms. Diatomic compounds are composed of molecules containing two atoms. ... The main difference between monatomic and diatomic compounds is the number of atoms present in those compounds.

Answer 2

A molecule that is made of just one atom, is called diatomic molecule.

This is a list of the seven diatomic elements.

The seven diatomic elements are:

• Hydrogen (H2)
• Nitrogen (N2)
• Oxygen (O2)
• Fluorine (F2)
• Chlorine (Cl2)
• Iodine (I2)
• Bromine (Br2)

All of these elements are nonmetals, since the halogens are a special type of nonmetallic element. Bromine is a liquid at room temperature, while the other elements all gases under ordinary conditions. As the temperature is lowered or pressure is increased, the other elements become diatomic liquids.

Astatine (atomic number 85, symbol At) and tennessine (atomic number 117, symbol Ts) are also in the halogen group and may form diatomic molecules. However, some scientists predict tennessine may behave more like a noble gas.

While only these seven elements routinely form diatomic molecules, other elements can form them. However, diatomic molecules formed by other elements are not very stable, so their bonds are easily broken.

How to Remember the Diatomic Elements

The elements ending with "-gen" including halogens form diatomic molecules.

An easy-to-remember mnemonic for the diatomic elements is:

Have No Fear Of Ice Cold Beer

Answer 3

Monatomic

Answer 4

A molecule with one atom is called a "monatomic molecule." Examples include helium gas (He) and neon gas (Ne), which exist as single atoms with no bonds to other atoms.