The first man-made element or artificial element which is produced because it is not found naturally in nature is Technicium, in 1937. Technicium has an atomic number of 43 and atomic mass of 98 g/mol.
Answer:
3.
Explanation:
There are 3 bonds to the oxygen atoms.
The Valency of the aluminium is 3.
You would expect Na to have the larger ionic radius