When there is nuclear blast does it imploded? Explain?

Nuclear fission bombs usually implode their cores to generate the fast fissile chain reaction. The core is a hollow sphere of plutonium, surrounded by a thick, spherical jacket of chemical explosive. When the jacket detonates, it generates a spherical shockwave inward which compresses the plutonium to criticality.

Up to now there was no implosion of a nuclear blast. Principally it can happen, however. Similar was Chernobyl, the so-called nuclear melting. It was a GAU, not a Super-GAU, fortunately.

No, it is an explosion not an implosion. A nuclear blast creates tons of energy from a relatively small place, this creates the explosion.

I could be wrong though, im no scientist.

pay attention to you English teacher. The science teacher can answer your question, but you need the English teacher