The diagram given below represents the atom of an element.
Which symbol gives the above information?

_{4}^{9} B e

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_{4}^{9} F

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_{4}^{9} B

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_{4}^{9} O

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Solution

The correct option is A $_{4}^{9} B e$
The element specified is has $5$ neutrons and $4$ protons and $4$ electrons. Thus its atomic number is $4$ and atomic mass number $= 5 + 4 = 9$
Thus it is Be and is represented as $_{4}^{9} B e$

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