Question

does spherical shape of atom means a solid spherical ??

Answer 1

No, an atom is composed of a dense core called the nucleus and orbiting electrons (which orbit in a spherical path). The electron shell is not solid. Here's a representative model of what I'm referring to:

http://edtech2.boisestate.edu/millerc/edtech573/biochem_images/atom_structure_charges.jpg

Answer 2

it means when atom is combine with other atom their nucleus can colide

Answer 3

means in a cratal or molecule or lattice