As compared to 12C atom, 14C atom has:
1. | two extra protons and two extra electrons |
2. | two extra protons but no extra electron |
3. | two extra neutrons and no extra electron |
4. | two extra neutrons and two extra electrons |
1. | burning of hydrogen in the oxygen |
2. | fission of uranium present in the sun |
3. | fusion of protons during synthesis of heavier elements |
4. | gravitational contraction |