The element silicon (Si) is represented by the atomic number 14, which means it has 14 protons in its nucleus.
For the isotope 29Si, the mass number is the total number of protons and neutrons in the nucleus. To find the number of neutrons, we can subtract the atomic number from the mass number:
Number of Neutrons: 29 (mass number) – 14 (protons) = 15 neutrons.
As for electrons, in a neutral atom, the number of electrons equals the number of protons. Therefore, 29Si has 14 electrons.
Putting it all together, 29Si has:
- Protons: 14
- Neutrons: 15
- Electrons: 14
The mass number of this isotope is 29.