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Silicon's atomic number is 14.

Therefore it has 14 protons and 14 electrons.

The number of neutrons can vary by isotope.

Most silicon is silicon-28 with 14 neutrons.

There are stable isotopes with 15 or 16 neutrons.

The unstable (radioactive) isotope is silicon-32 with 18 neutrons (half-life 170 years).

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