Section 1: Organizing The Elements Flashcards
How did Antoine Lavoisier organize elements
Metals, non metals, gases, and earths
What elements were discovered first?
Mainly metals
Who was Dmitri Mendeleev
Teacher who needed to describe 63 elements. Arranged elements in periodic table.
How did Mendeleev organize the elements
Name, mass, properties.
In rows in order of increasing mass so that elements with similar properties were in the same column.
How do masses increase within a column
From top to bottom
What is a periodic table
An arrangement of elements in columns based on a set of properties that repeat from row to row
What did Mendeleev predict
That many elements were yet to be discovered
What did Mendeleev do that was special
He left spaces for new elements and offered the best explanation for how the properties of an element were related to its location on the table
What is a good test for the correctness of a scientific model
Whether the model can be used to make accurate predictions
How was the table useful
There was a close match between the predictions and the actual properties of new elements
Which element were proof of the table’s usefulness
Scandium, Germanium, and Gallium
