Embedded Files
Navigation:
Navigation:
"The best thing since sliced bread..."
"The best thing since sliced bread..."
The periodic table organizes all of the known elements firstly by their atomic number and secondly by their chemical properties.
The basis for our modern design was first proposed in 1869 by Russian chemist Dmitri Mendeleev, who noticed recurring patterns in the elements chemical properties. He arranged the elements into rows (periods) so that each column (family) would have similar chemical properties.
Mendeleev was also able to predict elements undiscovered at the time, such as germanium, because of gaps in his table.
Periods and Groups
Periods and Groups
Groups, also known as families, share similar chemical properties.
Along the rows you can observe periodic trends, such as increasing atomic mass or decreasing atomic size.
Metals, Nonmetals, and Metalloids
Metals, Nonmetals, and Metalloids
Metals have some common characteristics:
shiny
can be stretched or bent
conduct heat and electricity well
have a high melting point, and therefore solid at room temperature
Nonmetals have opposite characteristics:
Dull
poor conductors of heat or electricity
brittle
may be solids, liquids or gases at room temperature
Metalloids have properties in between metals and nonmetals. They are used in electronics because they are semi-conductors, meaning they somewhat conduct electricity.
With the exception of hydrogen metals are on the left side of the periodic table, and nonmetals on the right. Unsurprisingly, metalloids are in between metals and nonmetals.
Practice
Practice
Print this worksheet and color the periodic table according to the instructions. Then answer the questions.
Color Coding The Periodic Table.docPage updated
Google Sites
Report abuse