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47 Cards in this Set

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What is an element's atomic mass?
Average mass of the different forms of that element's atoms
How did Moseley change the arrangement of the elements on his periodic chart?
He rearranged the elements by atomic number
What is the basis for the periodic table?
The Periodic Law
What is the Periodic Law?
the repeating chemical and phiscial properties of elements relate to and depend on the elements' atomic numbers
When did Mendeleev discover a pattern to the elements?
1869
What was the pattern that Mendeleev discovered about elements?
Similar physical and chemical peroperties repeated in evert eighth element. There was a repeating pattern
How many groups did Mendeleev use to group the elements?
7 groups because every eighth element had similar properties
What is the smallest unit of mnass into which an element can be divided and still retain its properties?
An Atom
What does every atom contain?
A nucleus surrounded by one or more electrons
What type of charge do electrons have?
negative charge
What is an atom's nucleus usually made of?
Protons and Neutrons
What type of charge do protons have?
positive charge
What type of charge do neutrons have?
Neutral charge
T or F
A single proton or neutron has almost 200 times the mass of an electron?
False
2,000 times the mass of an electron
What is the atomic number of an element?
The number of protons in an atom's nucleus
What color do elements that are metals have as a background color?
blue
Which elements have a yellow background on their box on the periodic table?
gases
Which elements have green backgrounds on the periodic table?
Metalloids
T or F
The chemical symbols used on all periodic tables are used by scientists throughout the world.
True
List the items found in each box on the periodic table:
1. element's name
2. chemical symbol
3. atomic number
4. atomic mass
How; many letters are found in a chemical's chemical symbol?
one or two; 1 or 2
What is the name for the group of chemcials on the periodic chart that are in each horizontal row?
A period
Why is a row on the periodic table called a period?
The properties of elements in a row frollow a repeating or periodic pattern
What is the name for the elements located in a column on the periodic table?
Group
What is a group of elements also called?
A family
What type of element is the majority of elements?
Metals
Where are metals found on the periodic table?
To the left of the zig-zag line
What type of property is an element's state?
Physical property
Most metals are in what type of state at room temperature?
solid
What type of state is Mercury found in at room temperature?
liquid
What are solutions of metals are called?
alloys
T or F
Metals on the left side of the periodic table are not very reactive with oxygen.
False. They are very reactive with oxygen.
T or F
Metals near the zigzag line are much less reactive with oxygen.
True
What do many metals produce when they are combined with acids?
Salt and a hydrogen gas.
What is the common name for the reaction of Iron and Oxygen?
Rust
What are elements that have properties of both metals and nonmetals?
Metalloids
Where are metalloids located on the periodic table?
They border the zigzag line.
Who developed the first periodic table, Mendeleev or Moseley
Mendeleev
T or F
Properties of elements repeat in a regular pattern.
True
Who arranged the elements on a periodic table in increasing atomic numbers?
Moseley
T or F
Each element has a a chemical symbol that is recognized around the world./
True
T or F
Physcial and chemical properties of elements change across each period.
True
T or F
Elements in a group usually have similar properties.
True
T or F
Most metals do not combine easily with other elements to form compounds and alloys.
False. They combine easily.
T or F
Most nonmetals are gas at room temperature.
True
List the 3 nonmetals that are very important to living things:
Oxygen
Carbon
Nitrogen
What is the metalloid used to make computer chips?
Silicon