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Q.

A trivalent cation of an element contains 10 electrons. The atomic number of the element is-

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a

7

b

13

c

10

d

15

answer is C.

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Detailed Solution

Trivalent cation $= X^{+ 3} = 10 e^{-}$

$X - 3 e^{-} = 10 e^{-}$

$X = 10 + 3 e^{-} = 13 e^{-}$

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