* Ionic bonding involves the transfer of electrons between atoms, creating positively and negatively charged ions that attract each other. Silicon dioxide doesn't form through electron transfer.

* Physical changes alter the form or appearance of a substance but don't change its chemical composition. Combining atoms to form a new molecule is a chemical change.

* Thermal changes involve heat, but heat alone doesn't cause atoms to bond. You need the right conditions and chemical interactions.

Chemical bonding is the process where atoms share or transfer electrons to create a new substance with different properties. In the case of silicon dioxide (SiO2):

* Silicon (Si) shares its electrons with two oxygen (O) atoms.

* This sharing creates strong covalent bonds, forming a stable molecule of silicon dioxide.