First two drop down menus choices:
1. treasury
2. ionic
3. matrimonial
4. covalent

Third drop down menu choices:
1. 40kJ/mol
2. 4000kJ/mol
3. 400kJ/mol
4. 40000kJ/mol

First two drop down menus choices 1 treasury 2 ionic 3 matrimonial 4 covalent Third drop down menu choices 1 40kJmol 2 4000kJmol 3 400kJmol 4 40000kJmol class=