To determine why the model represents a neutral lithium atom, you can use the following responses:
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In the model there are three negative electrons surrounding the nucleus. In neutral atoms the numbers of protons and electrons match. - This confirms that the model is neutral and suggests an equal number of protons and electrons, consistent with lithium.
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The atomic number of lithium is three and there are three positive protons in the nucleus of this model. - This directly identifies the model as lithium based on the number of protons, which defines the element.
The other options provided either have inaccuracies (e.g., mentioning neutrons or stating that electrons are found inside the nucleus) or do not clearly indicate that they are exclusive to lithium. Thus, the first and last responses listed are the most appropriate choices.