An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.

Solution

No. of protons + No. of neutrons = Mass number = 81
Let number of protons in the atom be x
$space space therefore space space Number space of space neutrons space in space the space atom space equals space straight x plus fraction numerator 31.7 over denominator 100 end fraction cross times space straight x space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1.317 space straight x space space space space space space space space space space space space space$
$space space therefore space space space straight x space plus 1.317 straight x space equals space 81 space space space space space space space space space space space space 2.317 straight x space equals space 81 space therefore space space space space space space space space space space space space space space space straight x space equals space fraction numerator 81 over denominator 2.317 end fraction space equals 35 space therefore space space space space space space space Number space of space protons space equals space 35 space therefore space space space Atomic space number space of space the space element space equals space 35 space Element space with space atomic space number space 35 space is space Br$
$space therefore$ Atomic symbol is $space space Br presubscript 35 presuperscript 81.$

Some More Questions From Structure of Atom Chapter

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Structure Of Atom

An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.

Some More Questions From Structure of Atom Chapter

Why were neutrons discovered very late?

What are the fundamental particles present in a neutral atom having atomic number greater than 1?

Do protons and neutrons have identical mass?

When α-particles are sent through a thin metal foil, most of them go straight through the foil. What inference do you draw from it?

What did Rutherford's experiment on scattering of particles show for the first time?

What is Plum-Pudding model of the atom?

Are neutrons present in all atoms?

Why are electrons called planetary electrons?

What are nucleons?

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