HYDROGEN:Hydrogen is the most abundant element in the universe. It is the chief element that makes up the sun and other stars. On earth, hydrogen, mainly occurs in combined form as a constituent of water (about 11% by weight of water is hydrogen), petroleum, natural gas, coal, clay, and all animals and plants.
HYDROGEN:Hydrogen is the most abundant element in the universe. It is the chief element that makes up the sun and other stars. On earth, hydrogen, mainly occurs in combined form as a constituent of water (about 11% by weight of water is hydrogen), petroleum, natural gas, coal, clay, and all animals and plants.NITROGEN:
abundant element in the universe. It is the chief element that makes up the sun and other stars. On earth, hydrogen, mainly occurs in combined form as a constituent of water (about 11% by weight of water is hydrogen), petroleum, natural gas, coal, clay, and all animals and plants.NITROGEN:Nitrogen mainly occurs in the free state in the atmosphere. About 76% by mass of air is nitrogen. In the combined state, it is a constituent of minerals such as Chile saltpeter (NaNO3) and nitre (KNO3).OXYGEN:Oxygen is the most abundant element in the earth's crust. It occurs in the free state in the atmosphere, forming about 23% by mass of the atmosphere. In the combined state, it constitutes about 80% by mass of water. It is also present in the combined state in the earth's crust as oxides, carbonates and silicates of metals.
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It occurs in the free state in the atmosphere, forming about 23% by mass of the atmosphere.
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HYDROGEN:
HYDROGEN:Hydrogen is the most abundant element in the universe. It is the chief element that makes up the sun and other stars. On earth, hydrogen, mainly occurs in combined form as a constituent of water (about 11% by weight of water is hydrogen), petroleum, natural gas, coal, clay, and all animals and plants.
HYDROGEN:Hydrogen is the most abundant element in the universe. It is the chief element that makes up the sun and other stars. On earth, hydrogen, mainly occurs in combined form as a constituent of water (about 11% by weight of water is hydrogen), petroleum, natural gas, coal, clay, and all animals and plants.NITROGEN:
abundant element in the universe. It is the chief element that makes up the sun and other stars. On earth, hydrogen, mainly occurs in combined form as a constituent of water (about 11% by weight of water is hydrogen), petroleum, natural gas, coal, clay, and all animals and plants.NITROGEN:Nitrogen mainly occurs in the free state in the atmosphere. About 76% by mass of air is nitrogen. In the combined state, it is a constituent of minerals such as Chile saltpeter (NaNO3) and nitre (KNO3).OXYGEN:Oxygen is the most abundant element in the earth's crust. It occurs in the free state in the atmosphere, forming about 23% by mass of the atmosphere. In the combined state, it constitutes about 80% by mass of water. It is also present in the combined state in the earth's crust as oxides, carbonates and silicates of metals.