تكنيشيوم
43
Tc
المجموعة
٧
الدوري
5
المستوى الفرعي
d
البروتونات
الإلكترونات
النيوترونات
43
43
55
الخواص العامة
عدد ذري
43
الكتلة الذرية
[٩٨]
عدد الكتلة
98
الفئة
معادن انتقالية
اللون
فضة
النشاط الإشعاعي
نعم
From the Greek word technetos, artificial
البنية البلورية
سداسي بسيط
التاريخ
Element 43 was predicted on the basis of the periodic table, and was erroneously reported as having been discovered in 1925, at which time it was named masurium.
The element was actually discovered by Carlo Perrier and Emilio Segrè in 1937.
It was also found in a sample of molybdenum sent by Ernest Lawrence that was bombarded by deuterons in the Berkeley cyclotron.
The element was actually discovered by Carlo Perrier and Emilio Segrè in 1937.
It was also found in a sample of molybdenum sent by Ernest Lawrence that was bombarded by deuterons in the Berkeley cyclotron.
توزيع الإلكترونات لكل غلاف تكافؤ
2, 8, 18, 13, 2
توزيع إلكتروني
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
الخواص الفيزيائيّة
الطور
صلب
كثافة
١١٫٥ غرام/سم−3
نقطة الانصهار
٢٤٣٠٫١٥ K ٢١٥٧ | °C ٣٩١٤٫٦ °F
نقطة الغليان
٤٥٣٨٫١٥ K ٤٢٦٥ | °C ٧٧٠٩ °F
حرارة الانصهار
٢٣ كيلوجول·مول−1
حرارة التبخر
٥٥٠ كيلوجول·مول−1
السعة الحرارية
-
متوفر في قشرة الأرض
n/a
متوفر بشكل عام
n/a
رقم CAS
7440-26-8
PubChem CID Number
n/a
الخواص الذرية
نصف قطر ذري
١٣٦ pm
نصف قطر تساهمي
١٤٧ pm
الكهرسلبية
١٫٩ (مقياس باولنغ)
جهد التأين
٧٫٢٨ eV
الحجم الذري
٨٫٥ cm3/mol
الناقلية الحرارية
٠٫٥٠٦ W/cm·K
أرقام الأكسدة
-3, -1, 1, 2, 3, 4, 5, 6, 7
تطبيقات
Technetium is used in nuclear medicine to carry out a number of medical tests, mainly relating to imaging and functional studies of internal bodily organs like bone scan.
It is also used industrially for equipment calibration following its approval as a standard beta emitter.
Mild carbon steels may be effectively protected by minute quantities of technetium, but this corrosion protection is limited to closed systems because of technetium's radioactivity.
It is also used industrially for equipment calibration following its approval as a standard beta emitter.
Mild carbon steels may be effectively protected by minute quantities of technetium, but this corrosion protection is limited to closed systems because of technetium's radioactivity.
Technetium is harmful due to its radioactivity
نظائر
النظائر المستقرة
-النظائرغير المستقرة
85Tc, 86Tc, 87Tc, 88Tc, 89Tc, 90Tc, 91Tc, 92Tc, 93Tc, 94Tc, 95Tc, 96Tc, 97Tc, 98Tc, 99Tc, 100Tc, 101Tc, 102Tc, 103Tc, 104Tc, 105Tc, 106Tc, 107Tc, 108Tc, 109Tc, 110Tc, 111Tc, 112Tc, 113Tc, 114Tc, 115Tc, 116Tc, 117Tc, 118Tc