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Science Ch. 12

In period 4 what is the most metallic element?
Potassium
Calcium
Which element group/groups has all nonmetals?
3-12
17 & 18
The number at the top of the box in the periodic table means...
Atomic mass
Atomic number
Define period
Pure ______ are often stored in oil to keep them from reacting with water and oxygen
Alkaline-earth metals
Alkali metals
In the boron group the most common element is_____
Boron
Aluminum
Properties such as conductivity and reactivity change left to right in each
Group
Period
The elements in groups 3-12 are_____
Transition metals
Nonmetals
2 reasons hydrogen is unique
What is periodic law?
Which elements are in the same group of oxygen?
S, Se, Te, Po, Uuh
H, B, C, N, F, Ne
Very reactive nonmetals are...
Noble gasses
Halogens
Cement and chalk are compounds of...
Sodium
Calcium
Another name for metalloids
Semi-metal/semi-conductors
Nonmetals
Which category is chlorine in?
Nonmetals
Noble gasses
The group of elements that do not have individual names are called...
Metals
Transition metals
What element is used to make the most widely used compound in chemical history
Selenium
Sulfur
Periodic means...
Happening at regular intervals
Happening every other thing
The Periodic Law states...
Elements are randomly arranged
Pattern changes according to increasing atomic number
The elements to the right of the zig-zag line are...
Metalloids
Nonmetals
Most metals are...
Solids at room temp
Metallic
Most of the elements on the periodic table are...
Metals
Nonmetals
Mendeleev arranged elements by...
Increasing atomic mass
Chemical and physical properties
A horizontal row on the periodic table
Group
Period
How do physical/chemical properties change?
Across each period
Down each group
What is necessary for substances to burn
Helium
Oxygen
Transition metals are...
Ductile
Good conductors of thermal energy
Mendeleev noticed properties repeated every...
Period
7 elements
How would you describe most metals
Good conductors
Able to be drawn into thin wires (ductile)
How many of the recently discovered elements follow the periodic law?
None of them
All of them
Which is a property of Alkali metals
Very reactive
Ductile
What forms when a halogen reacts with a metal
Becomes a compound
Salt forms
What helps lightbulbs last longer?
Krypton
Argon
Which of these elements is least metallic
Celenium
Aluminum
Number beneath the carbon indicates ______
Chemical symbol
Atomic mass
Iodine and chlorine are examples of...
Noble gasses
Halogens
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