Key Definition
Matter: any substance (thing) that has mass and takes up space.
Atoms: smallest particles of an element that have the chemical properties of that element.
Element: it is a pure substance that cannot be broken down into two or more simpler substances by chemical processes.
Molecule: a molecule is a group of two or more atoms that are chemically combined (joined together)
Compound: it is a pure substance containing two or more elements that are chemically combined in a fixed ratio.
Key Ideas
- Matters can be broadly classified into 3 groups: element, compound and mixture.
- Elements can be broadly classified into metals and non-metals (hint: the ladder a.k.a Hays-McDaniel line)