- Mixing and reacting are two very different things. For example, we can mix sand and salt together and separate them easily.
- However, when the atoms of two or more elements react, they make a new compound which is different to both of the starting atoms.
- The alkali metals react easily with the halogens because the alkali metals must lose an electron to gain a full outer shell, and so pass it on to the halogens, which need to must gain one to make a full outer shell.
Sharing electrons - Covalent bonding
Transferring electrons - Ionic bonding
non-metal + non-metal
Giant covalent structures:
- made of carbon
- high melting and boiling points…