The Decay Constant of Radon-222 Is 0 $10^7$ B)767 × $10^7$ C)834 ×

The decay constant of radon-222 is 0.181 d^-1.If a sample of radon initially contains 6.00 × 10⁸ radon atoms,how many of them are left after 10.0 d?

A) 9.82 × $10^7$
B) 7.67 × $10^7$
C) 8.34 × $10 ^ { 8 }$
D) 7.29 × $10 ^ { 8 }$
E) 8.56 × $10 ^ { 8 }$