Boron (boron)

Japanese: ホウ素(硼素) - ほうそ（英語表記）boron

Periodic table Element symbol = B Atomic number = 5 Atomic weight = 10.811 ± 5 Abundance in the earth's crust = 10 ppm (36th place) Abundance of stable nuclides ^10B = 19.6%, ^11B = 80.4% Melting point = 2300 °C Boiling point = 2550 °C Specific gravity = 2.37 (crystalline), 1.73 (amorphous) Electron configuration = [He] 2s ² 2p ¹ Main oxidation number = III A non-metallic element belonging to group IIIB. It has been known since ancient times in the form of sodium borate (borax), and it seems that around 2000 BC Babylonia imported it from the Far East and used it for goldsmithing and welding, and Egypt and Rome also used it as a raw material for borosilicate glass.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

周期表元素記号＝B　原子番号＝5原子量＝10.811±5地殻中の存在度＝10ppm(36位)安定核種存在比　¹⁰B＝19.6％，¹¹B＝80.4％融点＝2300℃　沸点＝2550℃比重＝2.37(結晶)，1.73(無定形)電子配置＝［He］2s²2p¹　おもな酸化数＝III第IIIB族に属する非金属元素。ホウ酸ナトリウム(ホウ砂borax)の形で太古から知られており，前2000年ころのバビロニアでは極東地域から輸入して金細工や溶接に利用していたらしく，またエジプトおよびローマなどではホウケイ酸ガラスの原料としても用いられていた。

出典　株式会社平凡社世界大百科事典第２版について　情報

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