Because of their unreactivity, the noble gases were not discovered until 1868, when helium was detected spectrographically in the Sun.
ونظراً لعدم نشاطها الكيميائي فإن الغازات النبيلة لم تكتشف حتى 1868، حينما تم إكتشاف الهيليوم بواسطة المطياف في الشمس.
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