What atoms has the zero value?

Answer 1

No atom has atomic number zero.

All atoms have a stable isotope where they are electrically neutral ie with 0 electrical change.

Answer 2

In terms of Atomic Mass, the atom with a zero value is the neutron, as it has a mass close to zero. However, in terms of atomic charge, an atom with a zero value is a neutral atom, meaning it has an equal number of protons and electrons canceling out their charges.