The Periodic Table Flashcards
Who arranged the first proper Periodic Table of Elements?
Dmitri Mendeleev
Mendeleev arranged 50 elements known in 1869.
What was the basis for Mendeleev’s arrangement of the elements?
Properties of the elements and their compounds
He sorted elements into groups based on similar properties.
What pattern did Mendeleev notice when arranging the elements by atomic mass?
Elements with similar chemical properties formed columns
This arrangement revealed a periodic pattern.
What did Mendeleev do when elements ended up in the wrong columns?
He switched the order of the elements
This was done to keep elements with similar properties together.
Why did Mendeleev leave gaps in his Periodic Table?
To predict the properties of undiscovered elements
He used known properties to hypothesize about missing elements.
What element did Mendeleev predict, which is known today as germanium?
Ekasilicon
This prediction helped confirm his ideas about the periodic table.
How is the modern Periodic Table organized?
In order of ascending atomic number
This organization aligns with the patterns Mendeleev discovered.
What do the columns in the Periodic Table represent?
Groups of elements with similar chemical properties
Each group corresponds to the number of outer shell electrons.
What are the exceptions in outer shell electron configurations in the Periodic Table?
Group O elements
They have full outer shells of 8 electrons (or 2 for helium).
What do the rows in the Periodic Table represent?
Periods indicating the number of electron shells
Each new period corresponds to a new full shell of electrons.
True or False: The Periodic Table can be used to predict chemical properties.
True
The position in the table helps in predicting how reactions will occur.
Fill in the blank: The group to which an element belongs corresponds to the number of _______ it has in its outer shell.
electrons
