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Periodic Table Video

Define allotrope Elements that come in different forms
Example of an allotrope Carbon
Name 9 physical characteristics of elements color, odor, state, solubility, malleability, ductility, freezing point, melting point, melting point
Who was given credit for creating the periodic table? A Russian scientist named Dmitri Mendeleev
Why was Dmitri Mendeleev given credit for discovering the table? He predicted almost accurate properties for elements that had not yet been discovered.
What was Mendeleev's table based on? Increasing atomic mass
What is the current table based on? Increasing atomic number
Who changed the table? When? A British scientist named Henry Moseley in 1913
Who was the German scientist who was working on creating the table around the same time as Mendeleev? Lothar Meyer
Define atomic number The number of protons in an atom's nucleus
Define atomic mass The number of neutrons and protons (nucleons) in an atom's nucleus.
What are vertical columns in the table called? Groups or families
How many families are there in the table? 18
What are the horizontal rows in the table called? Periods
How many periods are in the table? 7
What is Group 1 called? alkali metals
What is Group 2 called? alkaline earth metals
What is Group 17 called? halogens
What is Group 18 called (both names)? inert gases or noble gases
What are elements located left of the staircase called? metals (besides hydrogen)
What are the elements located to the right of the staircase called? non-metals
What are the elements that border the staircase called? metalloids (besides aluminum and polonium)
How many metalloids are there? 7
What are the large group of elements in the center of the table (Groups 3-12) called? transition metals
What are the elements located at the bottom of the periodic table called? rare earth metals
How many elements are there? 118
Created by: 16bcleary