Word of the dayآج کا لفظ



MEANS: ملک کی حفاظت کے لئے ساحلی قلعہ بندی

معنی: قائم رہنا

Listen to Urdu Pronunciationالفاظ کے تلفظ سنئیے

Couplet of the day

آج کا شعر

Click on the below image to open up the complete image gallery. مکمل گیلری کو دیکھنے کے لئے نیچے دی گئی تصویر پر کلک کریں۔

Urdu Encyclopedia

اردو انسائیکلوپیڈیا

Protactinium پروٹیکٹینئم

English NameProtactinium
No name in Urduبروتکتینیوم(عربی)۔پروتاکتینیم(فارسی)۔پروٹیکٹینیَم(اُردو)۔
Element GroupRare Earth Elements
Chemical SymbolsPa



In 1900, William Crookes isolated protactinium as an intensely radioactive material from uranium; however, he could not characterize it as a new chemical element and thus named it uranium-X.Crookes dissolved uranium nitrate in ether, the residual aqueous phase contains most of the 234 90Th and 234/ 91Pa. His method was still used in the 1950s to isolate 234 90Th and 234/ 91Pa from uranium compounds. Protactinium was first identified in 1913, when Kasimir Fajans and Oswald Helmuth Göhring encountered the isotope 234Pa during their studies of the decay chains of uranium-238: 238 92U → 234/ 90Th → 234/ 91Pa → 234/ 92U. They named the new element brevium (from the Latin word, brevis, meaning brief or short) because of its short half-life, 6.7 hours for 234 91Pa.

Shair Collection

اشعار کا مجموعہ

Compilation of top 20 hand-picked Urdu shayari on the most sought-after subjects and poets

انتہائی مطلوب مضامین اور شاعروں پر مشتمل 20 ہاتھ سے منتخب اردو شاعری کی تالیف

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