how did making models contibute to understanding of chlorine as a disinfectant
The scientific skill that was used was analyzing.
the scientific skill that was used when scientists grouped chlorine the other natural elements.
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Have the same properties
they are grouped by the number of valence electrons.
Chemistry books say that he grouped the elements by atomic weight. That is not the same as density.
Group I, the Alkalai Metals
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MOSLEY
Have the same properties
Newland, Moseley, , Dobereiner, Mendeleeff...
they are grouped by the number of valence electrons.
there are grouped in clomesand rows ad groups
periodic table
Group are based on similar properties. The elements having same chemical properties are grouped together.
the Periodic Table of elements
hydrogen
Because they are!
Transition elements