They form from tiny molecules that start from compounds and have a chemical not physical bond.
A covalent bond forms when atoms share electrons.
Atoms are the smallest forms of matter that we have discovered.
molecules
there are four allotrpic forms of iron...
Two oxygen atoms, you sneaky person, you.
Strongest bond that forms between 2 atoms.
Each atom can exist in many forms on its own. Then when you combine each of the forms with each of the forms of the other atoms, the number of substances increases exponentially.
Valence Electrons
A compound is formed from atoms. Covalent bond is weaker.
Valence Electrons
hydrogen atoms share electrons when it forms covalent bonds
Molecule