chem 的問題

The atoms in each of the three molecules are joined together by covalent bonds.

CO :
triple bond, 2 are normal covalent bonds and 1 dative bond (O gives the electron pair)
Each of C and O has 8 electrons in the outermost shell.

NO :
double bond
O has 8 electrons in the outermost shell, but N has only 7.

SO2 :
two S=O double bonds
Each O has 8 electrons in the outermost shell, but S has 10.

2006-12-03 20:49:58 補充：
The molecules are held together by van der Waals' forces, which are intermolecules forces, but NOT chemical bonds.

well elaborated
but you missed his additional question-- radical (7e-)

All of them are Covalent bond.

Becoz they are form by 2 antion combine together.