WS 13.5 Ion Formation
Name:_____________________________p._____
DO NOT USE THE NOBLE GAS ABBREVATION FOR #1-4.
1. Write the electron configurations for sodium, chlorine, neon, and argon.
Na
Cl
Ne
Ar
2. Write the electron configuration for a sodium ION.
3. Write the electron configuration for a chloride ion.
4. Fill out:
Electron configuration
of the atom
e- Configuration
of the ion
Mg___________________________
__________________________
_____
_____
________
F___________________________
__________________________
_____
_____
________
K___________________________
__________________________
_____
_____
________
P___________________________
__________________________
_____
_____
________
Which Noble gas Ion
e- change
has this EC?
formula (#lost/gained)
Al___________________________
__________________________
_____
_____
________
O___________________________
__________________________
_____
_____
________
Br__________________________
__________________________
_____
_____
________
5. When potassium forms an ion, it acquires the same electron configuration as the noble gas Argon. Why do we still
call it potassium instead of argon.. how is it different from an argon atom?
6. Write the electron configurations of Pb, Pb+2, and Pb+4. (OK to use noble gas abbreviation)
Pb
Pb+2
Pb+4
7. Valence electrons are the electrons in the outermost shell (n-level) of the atom.
They are generally the electrons involved bonding: In covalent bonds, elements share valence electrons.
In ionic bonding, elements gain or lose electrons in the valence shell. For each element on this worksheet, underline
the valence electrons in the electron configuration, and note below how many valence electrons that atom has.
Na
Cl
Ne
Ar
Mg
F
K
P
Al
O
Br
Pb
8a. Fix your “fancy” periodic table so that the “A” and “B” columns are the same as the classroom tables.
b. Valence electron shortcut: How can you tell from the periodic table how many valence electrons an atom will have?
c. What charge of ion usually forms, for elements in these columns:
IA_____
IIA______
IIIA_____
VA_______
VIA________ VIIA_______
9. Which of these ions have a noble gas configuration? Cross out the ones that do NOT have a noble gas configuration.
For the ones that DO have one, write the symbol of the noble gas it matches.
Mg+2
Fe+3
Cu+2
As-3
As+5
Cr+6
Ca+2
S-2
Ag+1
Pb+2
Te-2
K+1
Al+3
Cr+3
La+3
Eu+3
10. How many electrons are in an oxygen atom?______ How many electrons are in an oxide ion?______
How many electrons are in a sodium atom?______ How many electrons are in a sodium ion?_______
Which noble gas has the same number of electrons as an oxide ion and a sodium ion?______
11. How many electrons are in a calcium atom?_____
How many electrons in a calcium ion?______
Write the symbol (including the charge) for five ions that have the same number of electrons as a calcium ion.
________
________
________
________
________
12. Write the symbol (including the charge) for three ions with the same number of electrons as Krypton.
(Include positive and negative ions) ________
________
__________