元素符号Ar表示什么物质~

Ar
元素符号:Ar
中文名称:氩
英文名称:Argon
原子序数:18
原子量:39.95
外围电子排布:3s2 3p6
核外电子排布:2,8,8
常见化合价:0
密度:0.0017824
溶点:-189.2
沸点:-185.7
所属周期:3
所属族数:0
原子半径:0.88
离子半径:
共价半径:0.98
同位素及放射性:Ar-36 Ar-38 *Ar-40
发现人:Sir William Ramsey,Baron Rayleigh
发现时间:1894
发现地点:苏格兰
名称由来:Greek:argos (inactive).
元素描述:Colorless,odorless,tasteless noble gas.It is the third most abundant element in the earth's atmosphere and makes up about 1%.
元素来源:Continuously released into the air by decay of radioactive potassium-40.Pure form is obtained from fractional distillation of liquid air.
元素用途:Used in lighting products.It is often used in filling incandescent light bulbs.Some is mixed with krypton in fluorescent lamps.Crystals in the semiconductor industry are grown in argon atmospheres.