Name _________________________________ Hour______
IONS
HOW and WHY do atoms form ions?
What ions will these atoms form?
O becomes…
Ga becomes…
I becomes…
F becomes…
N becomes…
Te becomes…
Al becomes…
H becomes…
Cs becomes…
Ca becomes…
Sn becomes…
Mg becomes…
All elements the same _________________ will form ions with the same charge.
Cations have _____________(gained/lost) electrons and have a
________________(positive/negative) charge. Anions have _____________
(gained/lost) electrons and have a ________________(positive/negative) charge.
Fill in the periodic table to the right with the correct charges above each group.
TRENDS
Define each characteristic then state each trend




Atomic radius:
o
________________ (increases/decreases) as you go across a row because…
o
________________(increases/decreases) as you go down a group because….
Ionic radius:
o
Cations are ______________ (bigger/smaller) than their atoms because…
o
Anions are ______________ (bigger/smaller) than their atoms because…
Ionization energy:
o
________________ (increases/decreases) as you go across a row because…
o
________________(increases/decreases) as you go down a group because….
Electronegativity
o
________________ (increases/decreases) as you go across a row because…
o
________________(increases/decreases) as you go down a group because….
TRENDS PRACTICE
1. Circle which is larger?
Ca OR Ca2+
B OR Ga
Se OR Se2-
N OR F
K OR K+
F OR Ne
N OR N3-
F OR F-
Cl OR I
2. Between the following elements: P, Cl, Na, Ar which has the:

Largest radius?

Highest electronegativity?

Lowest ionization energy?

Highest ionization energy?

Lowest electronegativity?

Smallest radius
3. Between the following elements: Br, Cl, I, F which has the:

Largest radius?

Highest electronegativity?

Lowest ionization energy

Highest ionization energy?

Lowest electronegativity?

Smallest radius?
4. List the following in increasing (smallest to largest) atomic radius.
Se, Ga, Kr, Ca
Te, S, Se, O
Na, O, C, F, Li
Br, Ar, Ga, K, As
5. List the following in decreasing (largest to smallest) ionization energy.
Si, Ar, Al, Na
Sr, Ba, Mg, Be
O, P, As, N, F
Ba, Ca, As, Sr, Br, Kr
6. List the following in increasing (smallest to largest) electronegativity.
Al, Cl, Ar, Na
K, Li, Rb, Cs, Na
So, P, N, Al, Mg
Sb, Cl, I, Sr, Te
7. Which element on the periodic table would have the highest ionization energy? (remember noble gases do not
have ionization energies)
8. Which element on the periodic table would have the largest atomic radius?