.Atomic number of the element of X is 25.The oxides are X 2 O 3 and X 2 O 5
a . Write down the subshell electronic configuration of X?
b. What is the oxidation state of X in X 2 O 3 ?
( oxidation number of oxygen is -2)
c . To which period and block does this element belong?
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Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d5
oxidation number of X is 3+
4th period and d block element
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