Assertion: element boron | /r/HasProperty | atomic number
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Source sentences:
text: Element Boron (B), Group 13, Atomic Number 5, p-block, Mass Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
text: The element boron (B, atomic number 5) is found in deposits in the earth's crust at a concentration of about 0.001% (10 ppm).