Understanding Noble Gas Configuration
Noble gases are the elements in Group 18 of the periodic table. They are very stable because they have a full outer shell of electrons. Atoms tend to gain or lose electrons to achieve this stable configuration.
Analyzing the Elements
* Aluminum (Al): Aluminum has 3 valence electrons. It tends to *lose* these electrons to become Al³⁺, which has the same electron configuration as neon (Ne).
* Oxygen (O): Oxygen has 6 valence electrons. It tends to *gain* 2 electrons to become O²⁻, which has the same electron configuration as neon (Ne).
* Bromine (Br): Bromine has 7 valence electrons. It tends to *gain* 1 electron to become Br⁻, which has the same electron configuration as krypton (Kr).
* Nitrogen (N): Nitrogen has 5 valence electrons. It tends to *gain* 3 electrons to become N³⁻, which has the same electron configuration as neon (Ne).
Summary
The ions that have the same number of electrons as a noble gas are:
* Al³⁺ (same as neon)
* O²⁻ (same as neon)
* Br⁻ (same as krypton)
* N³⁻ (same as neon)
