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Welcome
to….ChemJEOPARDY on
Periodic trends….
Periodic Trends in the properties of
atoms allow US to predict physical
_____ and chemical properties___.
Bonus: What scientist is given the
most credit because he published his
info first? Mendeleev
With periodic trends…Meyer and
Mendeleev both demonstrated a
connection between _atomic
mass____ and _elements
properties________.
The Modern Periodic Table
The modern periodic table contains boxes that
contain the element's _atomic #_____, _elements__,
__symbol_____ , and atomic _mass___.
In the periodic table, Groups are
the…..
A.
Rows of elements
B.
Elements in groups 1,2, and 13–18
C.
Columns of elements
D.
Elements in groups 3–12
E.
Elements are classified as metals,
nonmetals, and metalloids.
Why do elements in the same group have similar
properties?
Because…they have the same valence
electrons
The answer is ½ the distance between adjacent nuclei of 2
identical elements
Atomic size is a periodic trend influenced by electron
configuration. For metals, atomic radius is…….
Trends among elements in the periodic
table include their ________ and their
abilities to_________ or _______
electrons

B is the answer
A.
Shapes/lose/gain
B.
Size/lose/gain
C.
Shapes/gain/misplace
D.
Size/Lose/misplace
Atomic radius usually ________as you
move across the Periodic Table, and
_______ as you move down the Periodic
table. Answer is b
A.
B.
C.
D.

increases/increases
decreases/increases
decreases/decreases
increases/decreases
Bonus: why?
Ions …..(fill in each)
I.
i. An ion is an atom or bonded group of atoms with a _+______ or
_____-___charge.
II.
Atoms become charged by either __gaining__or losing __
electrons.
III.
Cations: atoms __lose _electrons and become __+_____ charged
IV.
Anions: atoms _gain__ electrons and become __-_____ charged
True/False
Anions – ARE actually Bigger than the
neutral atom, because the addition of
an electron increases electrostatic
repulsion ___True____.
Ionic Radius :True/False



The ionic radii positive ions (cations) generally decrease
from left to right.__true_______
The ionic radii of negative ions (anions) generally decrease
from left to right, beginning with group 15 or 16.__true_____
Both positive and negative ions increase in size moving
down a group.____true______
Atomic & Ionic RadiiMixed Practice
A
A.
B
C
If the figure represents the atoms helium, krypton,
and radon, match the letter to the correct atom.
A = Radon B =Kryp. C=hel
A.
If the figure represents a cation, an anion, and a
neutral atom from the same period, match the letter
to correct term.
A –anion
B -atom
C cation
Arrange the following elements in order of
decreasing Ionization Energy.
Al, Mg, Na, Si
___ to ___to ___to ____(lowest)
Which below is the ENERGY needed to
remove an electron from an atom of an
element in a gaseous state?
A. Ionic radius
B. Law of octets
C. Ionization energy
D. Electronegativity
E. Saturation
Ionization Energy
•
A.
B.
C.
D.



Ionization energy is defined as the energy required to remove an electron
from a gaseous atom. So, the First Ionization Energy is the energy
required to remove the first electron so it:
Decreases from left to right across a period
Increase from left to right across a period
Decreases from top to bottom in a group
Increases from top to bottom in a group
A&C
A&D
B&D
B& C
B& D
Octet Rule = true

Octet rule - states that atoms tend to gain, lose or share
electrons in order to acquire a full set of eight valence electrons.

The octet rule is useful for predicting what types of ions an
element is likely to form.
What is Electronegativity?
….
Electronegativity - Practice

Arrange the following in increasing order
of electronegativity( 1 point each)

Na, Li, K

Ca, Br, Se
Final Jeopardy!!!!!!
What is the trend for ionization energy?
How does this relate to atomic radius?