The Decay Constant of Radon-222 Is $0.181 \mathrm {~d} - 1$

Multiple Choice

The decay constant of radon-222 is $0.181 \mathrm {~d} - 1$ . If a sample of radon initially contains $6.00 \times 10 ^ { 8 }$ radon atoms, how many of them are left after $10.0 \mathrm {~d}$ ?

A) $8.56 \times 10 ^ { 8 }$
B) $9.82 \times 10 ^ { 7 }$
C) $8.34 \times 10 ^ { 8 }$
D) $7.67 \times 10 ^ { 7 }$
Е) $7.29 \times 10 ^ { 8 }$