It would protect best against C) Alpha radiation, as Beta radiation is stopped by lighter metals such as aluminium, and Gamma radiation can only be stopped by heavier metals such as lead.
A coordination number can be determined by the usage of an atom towards a molecule from seeing how many numbers of atoms would have to be combined together in an atom.
The correct answer is species
Yes, this is balanced. Each part of the substance (like Mg) has the same number on both sides.
Hope this helps you:)
