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DLA n蜳įeu.cict uoimmaun |
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Answer» Let the number of protons in the element be x. ∴ Number of neutrons in the element= x + 31.7% of x= x + 0.317 x= 1.317 xAccording to the question,Mass number of the element = 81∴ (Number of protons + number of neutrons) = 81X+1.317x=812.317x=81X=34.95~35Hence, the number of protons in the element i.e., x is 35.Since the atomic number of an atom is defined as the number of protons present in its nucleus, the atomic number of the given element is 35.∴ The atomic symbol of the element isBr |
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