The atomic number of silicon is 14. This means that a silicon atom has 14 protons in its nucleus. In a neutral atom, the number of protons equals the number of electrons, which it does here because silicon also has 14 electrons.
When it comes to neutrons, silicon in its most common isotope has 14 neutrons as well. Therefore, the atomic structure of this silicon atom can be summarized as follows: it has 14 protons, 14 neutrons, and 14 electrons.
Since the number of protons and electrons are the same, the charge of the silicon atom is neutral. In summary, a silicon atom with 14 neutrons and 14 electrons is neutral and has an atomic number of 14.