The CN stands for Canadian National. The people who built it.
Its name "CN" originally referred to Canadian National, the railway company that built the tower.
Canadian National or Canada's National
There are so many , all the s-block elements and most of the p-block elements, some are Sodium, Calcium, Nitrogen, carbon,sulphur. diamagnetic elements ussually have 2 electons in the last shell
The Cl2 molecule is diamagnetic. All of the electrons in its molecular orbitals are paired up. Therefore, it is not a magnetic molecule.