The elements which are most abundant in earth crust are:
Correct answer: A. Si and Al
- A. Si and Al
- B. Ca and Mg
- C. B and Ar
- D. B and Al
Explanation
Silicon (Si) and Aluminum (Al) are the two most abundant elements in the Earth's crust. They make up a significant portion of the Earth's crust by mass. Therefore, option a is correct.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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