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Stack #99948

Antoine Lavoisier French scientist who compiled a list of elements known at the time (23 elements).
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.
Lothar Meyer and Dmitri Mendeleev Both demonstrated a connection between atomic mass and elemental properties. Correctly leaves empty spaces and correctly predicts their properties.
Moseley discovers that each element has a unique # of protons which becomes the atomic number
periodic law there is a repeat in chemical and physical properties when elements are arranged according to increasing atomic number
Ion charged ion, gains or loses electrons
Octet Rule An atom is most stable with 8 valence e-
Periodic Trends properties that change across and down the periodic table in predictable ways
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.
Shielding effect reduction in attraction between the nucleus and the other e- due to e- between them.
Created by: eefine