![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihLVP2iztyJmeVAQJhb4QEeg5KOEh97iiaSjAWx0s4wspX373eesMpkj-7tfDFPW-HkMBs4c1iH88msZZwJD3kVxwufnj6pefh1cN81N8tXP1TrJVoofUGQl5zQPDWxb9ryp-3vry-GQ/s320/Hydrogen-atom.png)
- An atom consists of a nucleus which contains protons and neutrons. Around the nucleus are shell(s) which have a certain amount of electrons on them de
pending on how many electrons the substance has.
MOLECULES:
- When atoms join they form molecules. (Remember it can be made from just one element as well as multiple elements). Molecules are only held together by covalent bonds.
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