History of the Periodic Table
When Moseley rearranged the Periodic Table, he arranged it by increasing...
atomic number.
How many valence electrons does nitrogen (in Group 5A) have?
5 valence electrons
Draw the Lewis Dot Structure of bromine on the board.
. .
: Br :
.
What is the name of Group 1A?
A) Noble Gases
B) Alkaline Earth Metals
C) Halogens
D) Alkali Metals
D) Alkali Metals
The amazing thing about Mendeleev's Periodic Table was that it was designed in such a way that he was able to ______ based on the elements and properties around that space.
predict unknown elements
What would the charge be for an oxygen ion?
2- (it is found in Group 6A)
What is the chemical definition of a nonmetal?
Nonmetals like to gain electrons and become negative ions (anions).
What is the name of Group 7A?
Halogens
Dobereiner had elements arranged in groups of three elements with similar properties called...
triads
Atoms will become ions in order to have a full _____, which is when they have 8 valence electrons.
octet
Draw the Bohr model of a neutral carbon atom.
*picture on board"
What is the family name of all of the elements found in Group B?
transition metals
Newlands discovered the pattern known as the ______, which saw a repeating pattern every eight elements. This meant the 1st and the 8th elements had similar properties.
law of octaves
The atomic radius of an atom gets _____ as you go from left to right, because ______.
The atomic radius of an atom gets [smaller] as you go from left to right, because [you are adding more protons, which pulls the electrons closer to the nucleus].
What are the four physical characteristics of a metal?
Malleable, ductile, good conductors, and luster.
Daily Double! (worth double the points!)
What are the name of the name of the "staircase" of elements on the Periodic Table? Why are they known a a "borderline"?
Daily Double!!!!
The metalloids.
The elements to the left of the staircase are metals. The elements on the right are non-metals.
The metalloids have characteristics of both metals and nonmetals.
Who was known to be the "father of the Periodic Table?"
Dmitri Mendeleev
DAILY DOUBLE (worth double the points)
What is ionization energy? What is the trend from top to bottom for ionization energy? Why does it behave this way?
(DAILY DOUBLE!)
Ionization energy is the amount of energy needed to remove an electron.
Ionization energy decreases from top to bottom, since there are more energy levels. The larger the atom, the weaker the pull onto those electrons, which allows the electrons to be removed easily.
Draw the Bohr model for phosphorus, with two valence electrons excited into the 4th energy level.
*picture on board*
How many valence electrons do the Noble Gases have?
Also, which element is the exception?
How many valence electrons does the exception have?
Noble gases have 8 valence electrons.
Helium is the exception. It has 2 valence electrons, but still have a full valence shell.