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Elrrrrrrr · Answer 1 · 2018-12-01T11:13:22+0000

To get the number of unstable atoms:
Column 3: take 900 - 90 = 810 The numbers from column 2

To get the Number of decayed atoms:
take the 810 * 10% = 810 * .1 = 81

Follow the pattern for the rest of the table.

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