Sure, let's use the periodic table to identify the elements based on the provided electron configurations.
1. Electron Configuration: [ He ] [tex]\(2s^2\)[/tex]
- The brackets around "He" indicate that we start from the electron configuration of Helium, which is [tex]\(1s^2\)[/tex].
- Adding [tex]\(2s^2\)[/tex] to that configuration gives us [tex]\(1s^2 2s^2\)[/tex].
- This configuration corresponds to Beryllium (atomic number 4).
Therefore, the element is Beryllium.
2. Electron Configuration: [ Ne ] [tex]\(3s^2 3p^5\)[/tex]
- The brackets around "Ne" indicate that we start from the electron configuration of Neon, which is [tex]\(1s^2 2s^2 2p^6\)[/tex].
- Adding [tex]\(3s^2 3p^5\)[/tex] to that configuration gives us [tex]\(1s^2 2s^2 2p^6 3s^2 3p^5\)[/tex].
- This configuration corresponds to Chlorine (atomic number 17).
Therefore, the element is Chlorine.
3. Electron Configuration: [Xe] [tex]\(6s^1\)[/tex]
- The brackets around "Xe" indicate that we start from the electron configuration of Xenon, which is [tex]\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^{10} 5p^6\)[/tex].
- Adding [tex]\(6s^1\)[/tex] to that configuration gives us [tex]\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^{10} 5p^6 6s^1\)[/tex].
- This configuration corresponds to Cesium (atomic number 55).
Therefore, the element is Cesium.
4. Electron Configuration: [[tex]\(\operatorname{Ar}\)[/tex]] [tex]\(4s^2 3d^9\)[/tex]
- The brackets around "Ar" indicate that we start from the electron configuration of Argon, which is [tex]\(1s^2 2s^2 2p^6 3s^2 3p^6\)[/tex].
- Adding [tex]\(4s^2 3d^9\)[/tex] to that configuration gives us [tex]\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^9\)[/tex].
- This configuration corresponds to Copper (atomic number 29).
Therefore, the element is Copper.
In summary, the elements represented by the given electron configurations are:
- [tex]\([ He ] 2 s^2\)[/tex] : Beryllium
- [tex]\([ Ne ] 3 s^2 3 p^5\)[/tex] : Chlorine
- [Xe] [tex]\(6 s^1\)[/tex] : Cesium
- [tex]\([\operatorname{Ar}] 4 s^2 3 d^9\)[/tex] : Copper
DONE
