A. Silicon
B. Radium
C. Aluminum
D. Carbon
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It’s Silicon not Radium
its Radium. please search it
Silicon: it is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates. More than 90% of the Earth’s crust is composed of silicate minerals, making silicon the second most abundant element in the Earth’s crust (about 28% by mass) after oxygen.
yes correct awnser is silicon
Read the question again…..
The Most abundant element is oxygen after that the second most abundant is silicon then aluminum, iron, calcium, sodium, potassium..
Correct it.
Oxygen,Silicon and Aluminium are the three most common elements im the earth crust.
we are taking about not present so Radium is the correct awnser.