atomic structure

noun Physics.
the structure of an atom, theoretically consisting of a positively charged nucleus surrounded and neutralized by negatively charged electrons revolving in orbits at varying distances from the nucleus, the constitution of the nucleus and the arrangement of the electrons differing with various chemical elements.

Origin:
1895–1900

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World English Dictionary
atomic structure
 
n
the concept of an atom as a central positively charged nucleus consisting of protons and neutrons surrounded by a number of electrons. The number of electrons is equal to the number of protons: the whole entity is thus electrically neutral

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Example sentences
He grew it in the lab and then placed it in a high-pressure, high-temperature
  furnace that changed the diamond's atomic structure.
But when it comes to outreach, it's the perfect entry-level model for atomic
  structure.
The properties of oxygen are well-known and due to its atomic structure.
He and his group are trying to understand the atomic structure of the material
  so that they can harness it to make a solar cell.
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