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Answer :
Final answer:
The number of neutrons in an isotope is calculated by subtracting the atomic number from the atomic mass number. In the case of Strontium, none of the provided options is correct. The correct neutrons are 46 for Sr-84, 48 for Sr-86, 49 for Sr-87, and 50 for Sr-88.
Explanation:
The number of neutrons in an isotope can be determined by subtracting the number of protons, which is also the atomic number of the element, from the atomic mass number. Strontium (Sr) has an atomic number of 38, meaning each isotope has 38 protons. Given this, you subtract 38 from the atomic mass numbers of the isotopes Sr-84, Sr-86, Sr-87, and Sr-88 to get the number of neutrons for each.
So, for Sr-84: 84-38 = 46 neutrons; for Sr-86: 86-38 = 48 neutrons; for Sr-87: 87-38 = 49 neutrons; and for Sr-88: 88-38 = 50 neutrons.
Therefore, none of the provided options (A, B, C, or D) is correct. The correct number of neutrons for each isotope of Strontium are as calculated above.
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