Multiple Choice
Since sodium (Na) is in period three of the periodic table, which of the following statements is correct about its electron configuration?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following pairs of elements are the most abundant in the continental crust?
A
Aluminum and magnesium
B
Iron and calcium
C
Oxygen and silicon
D
Sodium and potassium
Verified step by step guidance1
Understand that the continental crust is primarily composed of certain elements that form the majority of its minerals.
Recall that oxygen is the most abundant element in the Earth's crust because it forms oxides with many other elements.
Recognize that silicon is the second most abundant element in the continental crust, mainly because it forms silicate minerals, which are the most common minerals in the crust.
Compare the given pairs of elements to see which pair includes the two most abundant elements in the continental crust.
Conclude that the pair 'Oxygen and silicon' is the most abundant in the continental crust, as these two elements together make up the majority of the crust's composition.
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