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The atomic mass of Sr is 87.62. Given that there are only three naturally occurring isotopes of strontium, 86Sr, 87Sr, and 88Sr, which of the following must be true?

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The atomic mass of Sr is 87.62. Given that there are only three naturally occurring isotopes of strontium, 86Sr, 87Sr, and 88Sr, which of the following must be true?






 
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