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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Bishal Paul posted an Question
April 18, 2021 • 12:37 pm
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30 points
30 points
- CSIR NET
- Life Sciences
Q1. silicon is much more plentiful than carbon in earth's crust, moreover both have similar bonding capacity as they are in the same group of the periodic table
Q1. Silicon is much more plentiful than Carbon in Earth's crust, Moreover both have similar bonding capacity as they are in the same group of the periodic table. However Biomolecules are Carbon based. Give reasons why Carbon based compounds are selected for in biological systems ?
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Krishan k jakhad Best Answer
Oxygen and silicon are notably the most common elements in the crust. On Earth and in rocky planets in general, silicon and oxygen are far more common than their cosmic abundance. The reason is that they combine with each other to form silicate minerals. Other cosmically-common elements such as hydrogen, carbon and nitrogen form volatile compounds such as ammonia and methane that easily boil away into space from the heat of planetary formation and/or the Sun's light. Abundance is measured in one of three ways: by the mass-fraction (the same as weight fraction); by the mole-fraction (fraction of atoms by numerical count, or sometimes fraction of molecules in gases); or by the volume-fraction for gases e.g oxygen. Abundance (atom fraction) of the chemical elements in Earth's upper continental crust as a function of atomic number. The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.3%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium 2.0%, and titanium 0.61%. Other elements occur at less than 0.15%. 14 silicon Si 161000 150,000,000 are Atomic Number, Name, Symbol, Mass fraction (ppm), and Atomic fraction (ppb).