What is the element that is in the highest percentage in the composition of the earth ?
A). Silicon
B). Oxygen
C). Magnesium
D). Iron
Oxygen
Oxygen has the highest percentage in both human body and on earth, but carbon, the element with the second highest percentage in the body, is relatively rare on Earth.
1. The antiparticle of an electron is
3. The term 'brown air' is used for
4. The open "Sigrees" or coal stoves often require fanning to sustain burning because of
5. Major portion of the earth’s crust is mainly constituted by
6. Byproduct obtained by soap industry is
7. Which of the following elements is not present in stainless steel?
10. Which one of the following forms of phosphorus is most reactive?