Among the following species the highest radius is of :–A Al+3 B F– C Na+ D N3–

The size of an ion is determined by its atomic radius, which is the distance from the nucleus to the outermost electron shell.

1. Al+3: When an atom loses electrons and forms a positive ion, the size decreases. Al+3 means that the aluminum atom has lost three electrons, making it smaller.

2. F–: When an atom gains electrons and forms a negative ion, the size increases. F– means that the fluorine atom has gained one electron, making it larger.

3. Na+: Similar to Al+3, Na+ means that the sodium atom has lost one electron, making it smaller.

4. N3–: Nitrogen has gained three electrons, making it larger.

So, among Al+3, F–, Na+, and N3–, the species with the highest radius is N3– because it has gained the most electrons.