The number of protons and the number of neutrons is 14.
The most common isotope of silicon is silicon 28 with the mass number=28 and atomic number=14.
An atomic number is defined as the number of protons or the number of electrons present in the given element. The atomic number is used to define the chemical properties of the elements. The atomic number of silicon is 14. Hence the number of protons is 14.
The mass number is defined as the combined total of the number of protons and the number of neutrons present in the given element. The mass number of silicon is 28. Hence the number of neutrons=28-14=14.
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