so naphthalene can be superaromatic? am I right?
Having looked at it a bit further the term 'superaromatic' doesn't seem to be quite as well defined as aromaticity. There don't appear to be many publications that reference it and it doesn't appear at all in my (i.e I own it, I didn't write it) otherwise comprehensive textbook on Physical Organic Chemistry.
'Aromaticity' is well defined by Huckel's rule but 'superaromaticity' seems to be a fluffy term related to extra stabilisation that one could expect from a highly extended conjugated ring system over and above an extended linear one. More precisely, it seems to have been most applied to ring systems made exclusively of fused or interconnected benzene rings.
In Aihara, Chemical Physics Letters Volume 381, Issues 1-2, 4 November 2003, Pages 147-153
this definition is presented:
'By superaromaticity we mean aromatic stabilization due to cyclic motion of π-electrons along the macrocycle
Since naphthalene is not a macrocycle, it would not be considered to be 'superaromatic'. Though this appears to be simply a question of nomenclature, rather than being based on any physical/chemical principles.