So, different elements are made of different atoms. For example, we've got lead and we've got gold. They're both elements. Presenter: Mm-hm. Teacher: But a piece of pure gold will contain only ...

So, different elements are made of different atoms. For example, we've got lead and we've got gold. They're both elements. Presenter: Mm-hm. Teacher: But a piece of pure gold will contain only ...