The task was made more difficult because not all of the elements were known. Scientists began to look at ways to arrange them systematically so that similar properties could be grouped together, just as someone collecting seashells might try to organise them by shape or colour. ![]() Some were gases, some were shiny metals, some reacted violently with water, and so on.Īt the time when elements were first being discovered, the structure of atoms was not known. When scientists began collecting elements in the 1700s and 1800s, slowly identifying new ones over decades of research, they began to notice patterns and similarities in their physical properties.
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