Assertion: iodine's number | /r/HasProperty | atomic
Facets:
Source sentences:
text: Iodine is a chemical element that has the symbol I and atomic number 53.
text: Iodine has the atomic number 53 in the Periodic Table of Elements.
text: Its atomic number (which is the number of protons in it) is 53, and its atomic mass (the number of protons plus neutrons) is 127.