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4.2-4.4/ 2013-14

Who created the first periodic table? Mendeleev
How did Mendeleev arrange the elements? In order of increasing atomic mass
How was the periodic table re-arranged later? in order of increasing atomic number
Which group has the most elements? metals
Rows are called? Periods
Columns are called? groups or families
What is the sun mostly made of? Hydrogen
Nuclear fusion? Combining 2 nuclei
What are physical characteristics of metals? shiny, malleable (hammered into a thin sheet), ductile (pulled into a long wire), can conduct electricity, high melting and boiling points
Chemical properties of metals? reactive (can easily combine with another element); corrosive
Metals react by ___________ electrons losing
Most reactive metal? francium
How does the reactivity of metals change as you go from left to right on the periodic table? It decreases
What kind of metals are located in group 1? alkali metals
What kind of metals are located in group 2? alkaline earth metals
how do alkaline earth metals react with other elements? lose 2 electrons
What kind of metals are found in groups 3-12? transition metals
Where are metalloids located? along both sides of the zig zag line
Metalloids have properties of both ___________ and _____________________ metals and non-metals
Where are non-metals? on the right side of the periodic table
What is the most useful property of a metalloid? Its ability to conduct electricity
What is the most common metalloid? silicon
What is a semiconductor? conducts electricity under certain circumstances but not under all circumstances
What are the characteristics of non-metals? the opposite of metals
What is the non-metal that is the most reactive element known? fluorine
Which non-metal is a liquid at room temperature? bromine (Br)
Where are halogens located? group 17
What does halogen mean? salt forming
How do halogens react with other elements? they gain or share one electron
Where are noble gases found? in group 18
Why are noble gases unreactive? They have a full outer shell (8 electrons are in that outer shell).
Why is hydrogen in group 1 even though it is not a metal? It has one valence electron.
Created by: mtnbrook