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प्रश्न
What is the position of elements La (Z = 57) and Ce (Z = 58) respectively in the long form of periodic table?
विकल्प
La = Group-4, Period-7
Ce = Group-5, Period-7La = Group-3, Period-6
Ce = Group-3, Period-6La = Group-3, Period-7
Ce = Group-3, Period-6La = Group-3, Period-6
Ce = Group-3, Period-7
MCQ
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उत्तर
La = Group-3, Period-6
Ce = Group-3, Period-6
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Inner transition (f block) elements
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