History of the Periodic Table
Who devised the periodic table?
Dmitri Mendeleev
Define group
A group is a column in the periodic table. Also known as families.
Where are metals located on the periodic table?
To the left of the transition line.
How many valence electrons do the alkali metals have?
1
How did Mendeleev organize the elements?
Atomic Mass
Define period
A period is a row in the periodic table.
Where are the Alkali Metals located on the Periodic Table?
Group one (not including hydrogen).
How many valence electrons do the transition metals have?
Varies between 1, 2, and 3.
What did William Ramsay contribute to the Periodic Table?
Discovered the Noble Gases.
Define valence electrons
Electron in outermost shell.
Where are the transition metals located?
The D block on the periodic tables.
6
What did Henry Moseley contribute to the Periodic Table?
He ordered it by atomic number.
What is the octet rule?
States that atoms tend to form compounds in ways that give them eight valence electrons.
Where are the noble gases located on the periodic table?
Group 18 (the last column/group on the periodic table).
How many valence electrons does the nitrogen group have?
5
What is the Periodic Law?
The physical and chemical properties of the elements repeat when they are arranged by increasing atomic number.
Define electron affinity
The change in energy of a neutral atom when an electron is added to the atom to form a negative ion.
Where are the Halogens located on the periodic table?
Group 17 on the periodic table.
How many valence electrons does the carbon group have?
4