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प्रश्न
Select the correct answer from the answer in the bracket to complete the sentence.
An element has electronic configuration 2, 8, 1 and 12 neutrons. Its mass no. is ________.
विकल्प
11
23
12
उत्तर
An element has electronic configuration 2, 8, 1 and 12 neutrons. Its mass no. is 23.
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