Which of the following elements form chemical bonds between their atoms?OxygenHeliumCarbonIron

All elements, except for noble gases like Helium, form chemical bonds between their atoms. Therefore, Oxygen, Carbon, and Iron form chemical bonds between their atoms.

All elements form chemical bonds between their atoms, except for noble gases under normal conditions. Here's why:

1. Oxygen (O): Oxygen atoms readily form chemical bonds. They can form bonds with other oxygen atoms to form O2 molecules (oxygen gas), and they can also form bonds with other elements like hydrogen to form water (H2O).

2. Helium (He): Helium is a noble gas, and under normal conditions, it does not form chemical bonds with other atoms, including other helium atoms. This is because its outermost electron shell is full, so it doesn't need to gain, lose, or share electrons to achieve stability.

3. Carbon (C): Carbon atoms can form very strong chemical bonds with other carbon atoms and with other elements. This ability to form strong, stable bonds is what makes carbon the basis for all life on Earth.

4. Iron (Fe): Iron atoms can form chemical bonds with other elements. For example, iron can bond with oxygen to form iron oxide (rust).

So, the answer is Oxygen, Carbon, and Iron.