B. All atoms of silver have the same atomic number but different numbers of neutrons in the nucleus.
Answer:
this is difficult but simple to answer
Explanation:
all atoms move in 1 direction no more than 2
Answer:
yes, it is a homogeneous mixture because the different parts cannot be seen.
Explanation:
Answer:

Explanation:
First you should calculate the volume of a big sphere,so:



Then you calculate the volume of a small spehre, so:



Finally you subtract the two quantities:


I believe the answer is concentration
Sorry if I’m wrong hope this helps