boron

[化]硼英释中释na very hard almost colourless crystalline metalloid element that in impure form exists as a brown amorphous powder. It occurs principally in borax and is used in hardening steel. The naturally occurring isotope boron-10 is used in nuclear control rods and neutron detection instruments. Symbol: B; atomic no: 5; atomic wt: 10.81; valency: 3; relative density: 2.34 (crystalline), 2.37 (amorphous); melting pt: 2092°C; boiling pt: 4002°C

1 boron nitride,氮化硼；一氮化硼

2 boron carbide,[化]碳化硼

3 cubic boron nitride,[材料学]立方氮化硼

4 boron trifluoride,三氟化硼

5 boron steel,硼钢

6 boron oxide,氧化硼；二氧化硼

1 He said there should be an element under boron..他认为在，硼的下面也有个元素。

2 So, we have beryllium in the first case here, it has four electrons, that's how we know it's beryllium, boron has five electrons..那么我们将铍作为第一个例子，它有四个电子，这也是我们为什么能知道它是铍的原因，硼有五个电子。

3 Only small amounts of wurtzite boron nitride and lonsdaleite exist naturally or have been made in the lab so until now no one had realised their superior strength..天然存在或者实验室制造的纤锌矿型氮化硼和朗斯代尔石数量很少，直到现在，也没有一个人发现它们令人吃惊的硬度。