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isyllus

Answer: -

¹⁰B has the same number of neutrons as ⁹Be

Explanation: -

Mass number of ⁹Be = 9

Atomic number of ⁹Be = 4

Number of neutrons of ⁹Be = mass number - atomic number

= 9 - 4 = 5

Mass number of ¹⁰B = 10

Atomic number of ¹⁰B= 5

Number of neutrons of ¹⁰B= mass number - atomic number

=10 - 5 = 5

PBCHEM

Answer : Option B) \(^{10}B\)

Explanation : The option which has same number of neutrons as that of \(^{9}Be\) is \(^{10}B\)

As, \(^{10}B\) has 5 neutrons in its atom, the mass number of \(^{10}B\) is 10.

So, when it has 5 protons and 5 electrons in it then it would has 5 neutrons which is similar to that of \(^{9}Be\).

\(^{9}Be\) has 4 protons and 4 electrons in its atom which means it has (9 - 4) = 5 neutrons.

From, the above it is clear that \(^{10}B\) is the correct choice amongst the given options.

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