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Q.

Number of protons, neutrons and electrons in the element23189Y is

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a

89, 231,89

b

89,89, 242

c

89, 142, 89

d

142, 89 ,89

answer is C.

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Detailed Solution

In   Y892:31  number of protons and electrons is 89 and No.of neutrons= A - Z = 231 - 89 = 142.
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