뒤로Ions and Valence Electrons: Aluminum and Oxygen
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Ions and Valence Electrons: Aluminum and Oxygen
Classification of Elements
Understanding the properties of elements such as aluminum and oxygen is fundamental in GOB Chemistry, especially when predicting ion formation and chemical reactivity.
Aluminum (Al): Classified as a metal.
Oxygen (O): Classified as a nonmetal.
Valence Electrons
The number of valence electrons determines how an element will react chemically, especially in forming ions.
Aluminum (Al): Has 3 valence electrons.
Oxygen (O): Has 6 valence electrons.
Achieving an Octet: Electron Loss or Gain
Atoms tend to gain, lose, or share electrons to achieve a stable octet (8 valence electrons), following the octet rule.
Aluminum (Al): Must lose 3 electrons to achieve an octet.
Oxygen (O): Must gain 2 electrons to achieve an octet.
Resulting Ions: Symbols, Charges, and Names
When atoms gain or lose electrons, they form ions with specific charges and names.
Element | Ion Symbol | Ionic Charge | Ion Name |
|---|---|---|---|
Aluminum | Al3+ | +3 | Aluminum ion |
Oxygen | O2− | −2 | Oxide ion |
Key Points
Metals (like aluminum) tend to lose electrons and form cations (positively charged ions).
Nonmetals (like oxygen) tend to gain electrons and form anions (negatively charged ions).
Example: Electron Configuration and Ion Formation
Aluminum: Atomic number 13; electron configuration: 1s2 2s2 2p6 3s2 3p1. Loses 3 electrons to become Al3+.
Oxygen: Atomic number 8; electron configuration: 1s2 2s2 2p4. Gains 2 electrons to become O2−.
Relevant Equations
For aluminum ion formation:
For oxide ion formation:
