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#2 in Dalton's Atomic Theory
All atoms of a given elemen are identical, having the same size mass and chemical properties. The atoms of one element are different from the atoms of all other elements.
______ are composed of atoms of more than one element. In any compound, the ratio of the numbers of atoms of any two of the elements present is either an integer or a simple fraction. (#3 in Dalton's Atomic Theory)
A ______ involves only the seperation, combination, or rearrangement of atoms; it does not result in their creation or destruction. (#4 in Dalton's Atomic Theory)
The isotopes of hydrogen
same number protons, different numbers of neutrons theefore mass is different.
Natural abundance of elements in earths crust
oxygen 45.5%, silicon 27.2%, all others 5.3%, Magnesium 2.8%, Calcium 4.7%, Iron 6.2%, Aluminum 8.3%
Natural abundance of elemets in human body
Oxygen 65%, Carbon 18%, Al others 1.2%, Phosphorus 1.2%, Calcium 1.6%, Nitrogen 3%, Hydrogen 10%
an aggregate f wo or more atoms in a definite arrangement held together by chemical forces.
ion with a positive charge. If a neutral atomloses one or more electrons it becomes a cation.
ion with a negative charge. If a neutral atom gains on ore more electrons it becomes an anion.
shows the exact number of atoms of each element in the smallest unit of a substance.
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