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Radio active series
There are three radio active series depending on their progenitor.
They are
i) Uranium series called (2n+2) series,
ii) Actino-Uranium series, called (2n+3) series and
iii) Thorium series, called 2n series.
The number of unpaired electrons in the Fe2 + ion is: (1) 0 (2) 4 (3) 6 (4)3 Ans: 4
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How to obtain localized fringes
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