Question

identifying electron dot diagrams
which model represents the electron dot diagram of silicon?
three diagrams with si and different dot arrangements are shown, omitted here as per ocr text processing for image

Explanation:

Silicon (Si) has an atomic number of 14, so its electron configuration is $1s^22s^22p^63s^23p^2$. This gives it 4 valence electrons. Electron dot diagrams show valence electrons as dots around the element symbol, placed one at a time on the four sides (top, right, bottom, left) before pairing. So silicon's diagram has 4 unpaired single dots around the Si symbol.

Answer:

The first model: .$\ddot{\text{Si}}$$\boldsymbol{\cdot}$ (with one dot on the left, two on top, one on the right, one on the bottom, totaling 4 valence electrons)