When elements of group II-A (alkaline earth metals) are exposed to air, they quickly become coated with a layer of oxide. What is the purpose of this oxide layer?
Correct answer: C. The oxide layer protects the metal from further atmospheric attack
- A. The oxide layer exposes the metal to Atmospheric attack
- B. The oxide layer increases the reactivity of metal
- C. The oxide layer protects the metal from further atmospheric attack
- D. The oxide layer gives the metal a shiny silvery appearance
Explanation
The oxide layer can not react with air, and makes a physical barrier between air and metal.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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