Assertion: polonium's number | /r/HasProperty | melting point
Facets:
Source sentences:
text: Atomic number 84; melting point 254°C; boiling point 962°C; specific gravity 9.32; valence 2, 4.
text: Atomic number 84; melting point 254°C; boiling point 962°C; specific gravity 9.32; valence 2, 4.