Isotopes

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Isotopes

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Atoms of the same elements which have the same number of protons but different number of neutrons.

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The diagram shows the structure of three atoms. Which pair are isotopes? Options: P & R, P & Q, Q & R

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P & Q

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Study the table. Determine a pair of isotopes in the table. Options: K & M, L & M, K & L

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K & L

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Table shows the elements W, X, Y and Z with their respective number of protons, number of neutrons and nucleon number. Which of the following is a pair of isotopes? Options: W and Y, X and Y, X and Z, Y and Z

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X and Y

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Number of neutrons in magnesium isotope?

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13

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How many protons are in Bromine-71?

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35

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Approximately how many electrons are in Bromine-71?

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35

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How many neutrons are in Bromine-71?

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36

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An isotope has three forms: 30% have a mass of 4 amu, 20% have a mass of 5 amu, and 50% have a mass of 3 amu. What is the average atomic mass?

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4 amu

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There are two primary isotopes found in any sample of copper: copper-63 and copper-65. The isotope ⁶⁵Cu composes 69.2% of the sample and ⁶³Cu comprises the other 30.8%. Based on this data, what is the atomic mass of copper?

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64.4 amu