Periodic Table Flashcards
What is the Periodic Table?
The Periodic Table is a chart of the elements arranged into rows and columns according to their physical and chemical properties.
Who was Dimitri Mendeleev
Dimitri Mendeleev decided to organize the elements in order by atomic mass.
What does periodic mean?
Repeating pattern
What does a row represent?
What does a column represent?
Row - Period
Column - Group
What is the element
C O He Mg Cl Fe
Carbon Oxygen Helium Magnesium Chlorine Iron
Who was Henry Mosley
He rearranged the elements in order of their atomic number (we use that today)
Metals are elements that are:
Shiny- have luster
Ductile- flexible (easily pulled into wires)
Malleable- flattened (hammered into thin sheets)
Good conductors - conduct electricity well
What does the staircase represent?
Metalloids
What properties does a metalloid?
Some properties of metals and some of non metals
Elements in the periodic table are classified into what three main groups
Metals, non metals and metalloids
What percent are metals on the periodic table
Over 70% of elements are metals
