The only stable caesium isotope is 133Cs, with 78 neutrons.
Hope this answers your Q
Answer:
619.465 kilometers
Explanation:
1609 m = 1 mile
so 385 miles is equal to 619465 meters (385 x 1609= 619465)
1000 meters = 1 km
so 619465 meters is 619.465 kilometers
Other group because they weren’t in the right group
Do you have a picture of where you go this question from?
