Radioactive radium, ${ } ^ { 226 } \mathrm { R }$ , has a half-life of 1620 years. If you start with 5.00 grams of the isotope, how much will remain after 1000 years? Round your answer to two decimal places.
A)1.91 grams
B)4.74 grams
C)5.00 grams
D)2.70 grams
E)6.00 grams

Question

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The Answer of Radioactive radium, ${ } ^ { 226 } \mathrm { R }$ , has a half-life of 1620 years. If you start with 5.00 grams of the isotope, how much will remain after 1000 years? Round your answer to two decimal places.
A)1.91 grams
B)4.74 grams
C)5.00 grams
D)2.70 grams
E)6.00 grams

Radioactive Radium 226R{ } ^ { 226 } \mathrm { R }226R

Radioactive Radium ${ } ^ { 226 } \mathrm { R }$