زمین کی تہہ میں سب سے زیادہ کونسا عنصر پایا جاتا ہے؟
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A. Carbon Dioxide
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B. None of these
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C. Oxygen
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D. Ozone
Explanation
Most abundant element in Earth crust is Oxygen.
Oxygen in the crust is (46.1%).
The chemical formula of oxygen (dioxygen) is O2.
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List of 10 Most Abundant Elements in the Earth's Crust
| Sr# | Element | Abundance percent by weight |
| 1 | Oxygen | 46.10% |
| 2 | Silicon | 28.20% |
| 3 | Aluminum | 8.23% |
| 4 | Iron | 5.63% |
| 5 | Calcium | 4.15% |
| 6 | Sodium | 2.36% |
| 7 | Magnesium | 2.33% |
| 8 | Potassium | 2.09% |
| 9 | Titanium | 0.57% |
| 10 | Hydrogen | 0.14% |
زمین اور ماحول پر پانی سمیت زمین کے تقریبا %50 پرت ______ ہے؟
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A. Salts
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B. Oxygen
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C. None of these
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D. Plasma
Explanation
Priestly discover oxygen in 1776.
Oxygen makes up about 46-50% of the Earth's crust by weight, mainly in the form of oxides and silicates.
It is also a major component of water (H₂O).
It is abundant in the atmosphere as O₂.
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A. 97.6%
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B. 98.8%
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C. 99.7%
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D. 96.9%
Explanation
- Carbon-12 (C-12) is the most abundant of the two stable isotopes of carbon, amounting to 98.93% of elemental carbon on Earth.
- Carbon-12 is composed of six protons, six neutrons, and six electrons.
- The atomic mass of carbon-12 is exactly 12 Dalton's, by definition.
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