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(一) 铍元素的物理化学性质铍是一种重量轻、熔点高的金属元素。它的原子序数为4,原子量为9.0122,比重仅1.82,与镁相近,为铝的70％,钛的40％,仅为钢25％。但其拉伸强度却比镁高得多,特别是弹性模量在上述一些材料中是最高的,比钢高40％,比钛高一倍半。论它的比弹性模量值,比一般常用空间结构材料,高达六倍。因此,利用它作为航空及宇航系统部件的材料,有其优越性。它的熔点高达1284℃,但它却有硬而脆的缺点。在常温时,
(A) the physical and chemical properties of beryllium beryllium is a light weight, high melting point of the metal element. It has an atomic number of 4, an atomic weight of 9.0122 and a specific gravity of only 1.82, similar to magnesium, which is 70% of aluminum, 40% of titanium and only 25% of steel. However, its tensile strength is much higher than that of magnesium. In particular, the modulus of elasticity is the highest in some of the above materials, 40% higher than steel and about one and a half times higher than titanium. On its value of elastic modulus, than the commonly used space structure materials, up to six times. Therefore, it is advantageous to use it as a material for components of aerospace and aerospace systems. It has a melting point of up to 1284 ° C, but it has the drawback of being hard and brittle. At room temperature,