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Date: 24-12-2018
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Date: 5-12-2018
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Date: 13-11-2018
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Located in group 18 of the periodic table, the noble gases have a full valence electron shell. Because their valence shells are filled, the elements of group 18 are chemically stable. These elements all carry the common characteristic of being odorless monatomic gases under STP.
Xenon is an element under the Noble gases group and on period 7 of the periodic table. This element is most notable for its bright luminescent in light bulbs. Xenon is unique for being the first noble gas element to be synthesized into a compound. Xenon differs from the other noble gases by being heavier and denser than most.
Element | Atomic number | Atomic Mass (g) | Boiling Point (K) | 1st Ionization Energies (kJ/ mol) | Atomic Radii pm |
He | 2 | 4.003 | 4.216 | 2372.3 | 28 |
Ne | 10 | 20.18 | 27.1 | 2080.6 | 58 |
Ar | 18 | 39.948 | 87.29 | 1520.4 | 106 |
Kr | 36 | 89.3 | 120.85 | 1350.7 | 116 |
Xe | 54 | 131.29 | 166.1 | 1170.4 | 140 |
Rn | 86 | 222.1 | 211.5 | 202.2 | 150 |
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دراسة: حفنة من الجوز يوميا تحميك من سرطان القولون
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تنشيط أول مفاعل ملح منصهر يستعمل الثوريوم في العالم.. سباق "الأرنب والسلحفاة"
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تثميناً لجهودهم.. العتبة العباسية المقدسة تكرِّم اللجنة التحكيمية والجهات المساهمة بمسابقة فنِّ الخطابة
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