Question

An element with mass number of 81 contains 31.7% more neutrobs as compared to protons to.assign the atomic symbol

Answer 1

Answer:

Hey mate here is your answer.//

Explanation:

We know that mass number of the element,

A = p+n = 81,

Let the number of protons, p = x,

Then, number of neutrons,

n = x + 31.7 / 100x = 1.317 x,

(As number of neutrons are 31.7% more than the protons.),

Hence, from Eq. (i),

x + 1.317 x = 81,

x = 81 / 2.317 = 34.958 = 35 (approx),

Therefore, number of protons = 35 and the symbol is {35}^{81}Br,

(Number of protons = Atomic number).

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Answer 2

Answer:

Explanation:

:

We know that mass number of the element,A = p+n = 81,Let the number of protons, p = x,Then, number of neutrons,n = x + 31.7 / 100x = 1.317 x,(As number of neutrons are 31.7% more than the protons.),Hence, from Eq. (i),x + 1.317 x = 81,x = 81 / 2.317 = 34.958 = 35 (approx),Therefore, number of protons = 35 and the symbol is {35}^{81}Br,(Number of protons = Atomic number).Hope it helps you.//✔✔✔Please do mark me aas Brainliest.//