Which of the following has the electronic configuration as shown: 1s2 2s2 2p6 3s2 3p21 pointFAl3+S2-Si9. Sodium has

To determine which species has the electronic configuration of $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^2$, we can analyze the given options.

1. Break Down the Problem

   • We need to analyze each of the options provided and see which one corresponds to the electronic configuration that has 14 electrons in total, as deduced from the configuration above.

2. Relevant Concepts

   • The electronic configuration will tell us the number of electrons in an atom or ion. In this case, $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^2$ indicates a total of 14 electrons.

3. Analysis and Detail

   • The elements or ions we are considering are:
     • F (Fluorine): Atomic number 9, configuration is $1s^2 \, 2s^2 \, 2p^5$, not a match.
     • Al^3+ (Aluminum ion): Atomic number 13, configuration for Al would be $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^1$, but as a $3+$ ion, it has given up 3 electrons. Thus, its configuration is $1s^2 \, 2s^2 \, 2p^6$, not a match.
     • S^2- (Sulfide ion): Atomic number 16, with configuration $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^4$, also not a match.
     • Si (Silicon): Atomic number 14, the configuration is $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^2$, which matches perfectly.

4. Verify and Summarize

   • Among the provided options, only Silicon ($Si$) has the electronic configuration $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^2$ with a total of 14 electrons.

Final Answer

The element with the electronic configuration $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^2$ is Silicon (Si).