C3- periodic table
- Created by: safia rassool
- Created on: 12-06-16 16:49
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early periodic table
- during 19t century scientists had discovered elements but didnt know the structure of atoms
- they classified the elements on their atomic weights and properties
- Newlands preposed the law of octaves which said that every 8th element had similar properties
- he arranged the elements into 7 groups due to atomic weight
- other scientists didnt accept his ideas because the properties didnt match up
- Mendeleev left gaps for undiscovered elements so groups of known elements did have similar properties
- he predicted properties of missing elements
- his table was the basis for the periodic table and was accepted by scientists because his predictions on properties were correct
modern periodic table
- scientists found out about protons and neutrons at the start of 20th century
- elements were arranged in periodic table by atomic numbers and lined in vertical groups
- groups of elements have similar chemical properties because they have the same number of electrons in their outer shell
- going…
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