Answer: D. chlorine: 17 electrons
Explanation:
To determine the element corresponding to the given electron configuration ([tex]1s^22s^22p^63s^23p^5[/tex]), break it down first:
- 1s² represents the filling of the 1s orbital with 2 electrons.
- 2s² represents the filling of the 2s orbital with 2 electrons.
- 2p⁶ represents the filling of the 2p orbitals with 6 electrons.
- 3s² represents the filling of the 3s orbital with 2 electrons.
- 3p⁵ represents the filling of the 3p orbitals with 5 electrons.
Add up the electrons from each orbital and you will get 2 + 2 + 6 + 2 + 5 = 17 electrons.
Now look for the element on the periodic table that has an atomic number of 17 and you get Chlorine as your correct choice!
That's it!
