Stack #99948
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Antoine Lavoisier | French scientist who compiled a list of elements known at the time (23 elements).
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| John Newlands | Proposed an organization scheme for the elements. He came up with the periodic relationship in which there were elements that had similiar properties with the first and eighth, this was known as the rule of octaves. His law was not generally accepted.
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| Lothar Meyer and Dmitri Mendeleev | Both demonstrated a connection between atomic mass and elemental properties. Correctly leaves empty spaces and correctly predicts their properties.
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| Moseley | discovers that each element has a unique # of protons which becomes the atomic number
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| periodic law | there is a repeat in chemical and physical properties when elements are arranged according to increasing atomic number
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| Ion | charged ion, gains or loses electrons
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| Octet Rule | An atom is most stable with 8 valence e-
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| Periodic Trends | properties that change across and down the periodic table in predictable ways
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| Atomic Radius | As you go down a group, radius increases due to more energy levels. As you move across a period, radius decreases due to increase in nuclear charge.
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| Shielding effect | reduction in attraction between the nucleus and the other e- due to e- between them.
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Created by:
eefine
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