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Date: 25-1-2019
825
Date: 26-10-2018
925
Date: 13-3-2019
1037
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Lithium is the lightest of all metals and is named from the Greek work for stone (lithos). It is the first member of the Alkali Metal family. It is less dense than water (with which it reacts) and forms a black oxide in contact with air.
Atomic Number | 3 |
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Atomic Mass | 6.941 g/mol |
Atomic Radius | 152 pm |
Density | 0.534 g/cm3 |
Color | light silver |
Melting point | 453.69 K |
Boiling point | 1615 K |
Heat of fusion | 3.00 kJ/mol |
Heat of vaporization | 147.1 kJ/mol |
Specific heat capacity | 24.860 kJ/mol |
First ionization energy | 520.2 kJ/mol |
Oxidation states | +1, -1 |
Electronegativity | 0.98 |
Crystal structure | body-centered cubic |
Magnetism | paramagnetic |
2 stable isotopes | 6Li (7.5%) and 7Li (92.5%) |
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تفوقت في الاختبار على الجميع.. فاكهة "خارقة" في عالم التغذية
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أمين عام أوبك: النفط الخام والغاز الطبيعي "هبة من الله"
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قسم شؤون المعارف ينظم دورة عن آليات عمل الفهارس الفنية للموسوعات والكتب لملاكاته
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