What percent of a present amount of radioactive radium $\left( { } ^ { 226 } R a \right)$ will remain after 900 years?
A)45%
B)25%
C)65%
D)68%.

Name: What percent of a present amount of radioactive radium $\left( { } ^ { 226 } R a \right)$ will remain after 900 years? A)45% B)25% C)65% D)68%.
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The Answer of What percent of a present amount of radioactive radium $\left( { } ^ { 226 } R a \right)$ will remain after 900 years?
A)45%
B)25%
C)65%
D)68%.

What Percent of a Present Amount of Radioactive Radium (226Ra)\left( { } ^ { 226 } R a \right)(226Ra)

What Percent of a Present Amount of Radioactive Radium $\left( { } ^ { 226 } R a \right)$