The thing that they have in common is that they are all non metals
Answer:
It has 6 protons and its Carbon 14
Explanation:
After 100years, sample is 250g
After 200 years, sample is 125g
After 300years, sample is 62.5 g
156. Atomic mass if the number of protons and neutrons within an atom.
1 mole is 6.02x 10^23 molecules
3 * 6.02*10^23 =1.806*10^24 molecules
