2015 · Q41
Which of the following elements are found in highest and lowest quantities respectively in the crust of the earth?
General KnowledgeChemistry
- AOxygen and silicon
- BCalcium and sodium
- CSodium and magnesium
- DOxygen and magnesium
Explanation
Oxygen (about 46.6%) is by far the most abundant element in the Earth's crust, followed by silicon (about 27.7%). Among the lowest candidates, magnesium (about 2.1%) is less abundant than sodium (about 2.8%) and calcium (about 3.6%). Hence oxygen highest and magnesium lowest.