Number of Subatomic Particles
The number of protons, neutrons and electrons in the element silicon is 14.
How to find Subatomic Particles
If the element is stable then the number of protons and electrons will be the same as the atomic number.And if the element is not stable the number of electrons will be different, but the number of protons will remain the same as the atomic number.
To find the number neutrons all you have to do is round the atomic mass and subtract that from the atomic number.