Assertion: cobalt's number | /r/HasProperty | atomic
Facets:
Source sentences:
text: Cobalt is a chemical element with the symbol Co and atomic number 27.
text: Atomic number, 27; atomic weight, 58.9332.
text: Cobalt (symbol: Co; atomic number: 27) is a naturally-occurring free element that, once subjected to reductive smelting, becomes a hard and lustrous metal with a silver-gray appearance.
text: Its atomic number is 27 and its symbol is