Short Answer TypeWhat are the inner transition elements? Decide which of the following atomic numbers at the atomic numbers of the inner transition elements: 29, 59, 74, 95, 102, 104?
Inner transition metal are those element in which the last electron enters the f- orbital.
The element in which the 4f and 5f orbital are progressively filled are called f- block element.
The f-block elements are called inner transition elements. They consist of two series lanthanoids series having elements with atomic number form 57 to 71 and actinoid series having elements with atomic number from 89 to 103.
Hence, the elements with atomic number 59, 95 and 102 are inner transition elements and rest of them are not.
Long Answer TypeA green chromium compound (A) on fusion with alkali gives a yellow compound (B) which on acidification gives an orange coloured compound (C). ‘C’ on treatment with NH4Cl gives an orange coloured product (D), which on heating decomposes to give back (A). Identify A, B, C and D. Write equations for reactions.
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