H2 chemistry notes pdf - In chemistry, H2 refers to dihydrogen, also known as molecular hydrogen.

It is a diatomic molecule consisting of two hydrogen atoms joined by a single covalent bond. H2 is composed of two hydrogen atoms, each with one proton and one electron. This is the most common form of hydrogen found under standard conditions. - https://s3.dualstack.us-west-2.amazonaws.com/college.tuition/h2-chemistry-practical-papers.html