History of PT, Characteristics of Metals, Nonmetals and Metalloids

Based on properties
How did early chemists sort elements into groups?
He is credited with the “first”, but Lothar Meyer created one at about the same time
Did Mendeleev create the first periodic table?
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He was writing a textbook for his students. Wanted to help them make sense of all the elements and their properties.
What was Mendeleev’s purpose in creating the periodic table?
increasing atomic mass
What was the organizational scheme that Mendeleev used?
atomic number
In the modern periodic table, elements are arranged in order of _____________________
He left them for elements yet undiscovered. He knew that they existed based on the properties he trended.
Why were blanks left in Mendeleev’s table?
meaning Greek “peri” meaning around
“Periodic” comes from _________ meaning ________
a statement based on extensive experimentation and data
What is a law?
When elements are arranged in increasing atomic number, there is a pattern in the physical and chemical properties
State the periodic law.
left to right ———->
Periods go ________________ to ______________
up and down (columns)
Groups/Families go
Mg- same family (group)
Which element would have properties similar to calcium? and why?
Li Si Mg Ar
Li, K, Rb, Cs
Name two elements with similar physical and chemical properties to sodium.
far left and middle of PT
Where are metals located on PT?
upper right side
Where are nonmetals located on PT?
along stair step dividing line (between metals and nonmetals
Where are metalloids located on PT?
14% of elements are made up of these (metals, nonmetals or metalloids)
good conductors of heat and electricity
(metals, nonmetals or metalloids)
most of these elements are gases, a few are solids, and one liquid
(metals, nonmetals, or metalloids)
All are solids at room temperature
(metals, nonmetals, or metalloids)
80% of elements are in this major group
(metals, nonmetals or metalloids)
brittle, tend to shatter
(metals, nonmetals or metalloids)
Nonmetals (have solids, liquids and gases)
Greatest variation in properties of the three groups (metals, nonmetals or metalloids)
High luster, reflect light, malleable
(metals, nonmetals, or metalloids)
Only 6% of PT elements are these
(metals, nonmetals, or metalloids)
Semiconductors of heat and electricity (metals, nonmetals or metalloids)
Many are ductile (can be drawn into wires)
(metals, nonmetals, or metalloids)
Aluminum (metal, nonmetal or metalloid)
Polonium (metal, nonmetal or metalloid)
Silicon (metal, nonmetal or metalloid)
Hydrogen (metal, nonmetal or metalloid)

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