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Mass number of an atom is defined as the sum of protons and neutrons present in the nucleus. Since, the number of electrons are 9 and the atom is neutrons, therefore number of protons will also be equal to 9. Mass number is equal to protons + neutrons=19. Putting protons as 9, we get number of neutrons as 10. Hence, option B is correct.
Identify the segment that contains a grammatical error. If there is no error, select 'No error'.
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Read the sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Spot the error from...
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The following sentence has been divided into parts. One of them may contain an error. Select the part that contains the error from the given options.
Find the appropriate answer.
Read the sentence to find out whether there is any part with grammatical error in it.
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Identify the segment that contains a grammatical error. If there is no error, select 'No error'.
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