instruction:
In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
question:
The atomic radius of a chemical element is a measure of the size of its atoms , usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons .
answer:
The atomic radius of an element is the distance between the nucleus and the edge of the electron cloud .


question:
Space Shuttle " Endeavour " ( Orbiter Vehicle Designation : OV-105 ) is a retired orbiter from NASA 's Space Shuttle program and the fifth and final operational Shuttle built .
answer:
Space Shuttle Endeavour ( OV-105 ) is the fifth space shuttle run by NASA .


question:
In 1936 , the RSA awarded the first distinctions of Royal Designers for Industry ( RDI or HonRDI ) , reserved for " those very few who in the judgment of their peers have achieved ' sustained excellence in aesthetic and efficient design for industry " ' .
answer:

In 1936 , the RSA awarded the first distinctions of Royal Designers for Industry ( RDI or HonRDI ) .