Periodicity and the periodic table - Chemical Ideas 11.1
The periodic table
· The periodic table was produced in 1869 by a Russian chemist named Mendeleev. At the time there were only 61 elements into columns and rows.
· If the elements had similar properties they were placed in the same column.
· Mendeleev also left spaces in the table for elements that he believed existed but had not been discovered.
· Using the periodic table he was able to predict what properties the elements would have based on where they were in the periodic table.
The elements are now arranged based on their atomic number instead of their relative atomic mass
Periodicity
Periodicity- When there is a regular pattern in a property as you go across a period; the regular pattern is also repeated in the other periods.
· The periodic table was produced in 1869 by a Russian chemist named Mendeleev. At the time there were only 61 elements into columns and rows.
· If the elements had similar properties they were placed in the same column.
· Mendeleev also left spaces in the table for elements that he believed existed but had not been discovered.
· Using the periodic table he was able to predict what properties the elements would have based on where they were in the periodic table.
The elements are now arranged based on their atomic number instead of their relative atomic mass
Periodicity
Periodicity- When there is a regular pattern in a property as you go across a period; the regular pattern is also repeated in the other periods.
Melting point
The melting point of an element will increase until group 5 when it drops dramatically for the rest of the groups. They follow the same pattern as you go across period 3 Boiling point The boiling point of an element will increase until group 5 when it drops dramatically for the rest of the groups. They follow the same pattern as you go across period 3 |