Here's a breakdown:

* Core: This is where nuclear fusion takes place, generating the Sun's energy.

* Radiative Zone: Energy from the core travels outward through this zone in the form of photons. These photons constantly collide with particles, taking a very long time to reach the next layer.

* Convective Zone: This is the outermost layer of the Sun's interior. Here, energy is transported by the movement of hot gas, which rises and falls in a cycle.

* Photosphere: This is the visible surface of the Sun.

* Chromosphere: This is a thin layer above the photosphere.

* Corona: This is the outermost layer of the Sun's atmosphere, extending far into space.

So, to answer your question directly, the layer surrounding the Sun's core is the radiative zone.