What do a.m. and p.m. stand for?

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 of atomic structure
1895-1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for atomic structure
  • 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.
  • The properties of matter can be explained in terms of the atomic structure of matter.
  • Chemical reactions can be explained and predicted in terms of the atomic structure of matter.
British Dictionary definitions for atomic structure

atomic structure

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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