Element compound2. Select all the compounds from the following elements HE
Fe2O3
O2
P4
C2H4O2

and are the compounds.

Explanation:

A chemical compound is defined as a chemical substance that is formed by the combination of two or more atoms of different elements which cannot be separated by any physical means but when chemically treated, they decompose into their parent elements.

For example, water is made up of hydrogen and oxygen. This compound is a liquid and its individual components are gases. When water is decomposed, it forms hydrogen and oxygen gas.

For the given options:

He(Helium) is an element formed by the combination of only type of atoms.

and are molecules of same element.

is a compound fomed by the combination of iron and oxygen atoms.

is a compound fomed by the combination of carbon, hydrogen, and oxygen atoms.

Hence, and are the compounds.

first one is the correct answer