Lab #8 Worksheet #1 Name ______period ____

Electron configurations and the arrangement of atoms on the Periodic Table allow us to predict and explain the stability and reactivity of the atoms. Complete the worksheet to develop an understanding.

column IA column IIA column IIIA

#3 Li
lithium
e- config.
to become stable-
charge of the stable ion-
isoelectronic with
#11 Na
sodium
e- config.
to become stable-
charge of the stable ion-
isoelectronic with / #12 Mg
magnesium
e- config.
to become stable-
charge of the stable ion-
isoelectronic with / #13 Al
aluminum
e- config.
to become stable-
charge of the stable ion-
isoelectronic with
#19 K
potassium
e- config.
to become stable-
charge of the stable ion-
isoelectronic with / #20 Ca
calcium
e- config.
to become stable-
charge of the stable ion-
isoelectronic with

Ionization energy- energy required to remove last electron-

Which element has the last lowest ionization energy? Explain why.

What happens to ionization energy as you move down a column on the table? Explain why.

What happens to ionization energy as you move across a row on the table? Explain why.


column V A column VI A column VII A

#7 N
nitrogen
e- config.
to become stable-
charge of the stable ion-
isoelectronic with / #8 O
oxygen
e- config.
to become stable-
charge of the stable ion-
isoelectronic with / #9 F
fluorine
e- config.
to become stable-
charge of the stable ion-
isoelectronic with
#15 P
phosphorus
e- config.
to become stable-
charge of the stable ion-
isoelectronic with / #16 S
sulfur
e- config.
to become stable-
charge of the stable ion-
isoelectronic with / #17 Cl
chlorine
e- config.
to become stable-
charge of the stable ion-
isoelectronic with
#35 Br
bromine
e- config.
to become stable-
charge of the stable ion-
isoelectronic with

Electronegativity- Attraction or pull on electrons.

Which element has the greatest electronegativity? Explain why.

What happens to electronegativity as you move down a column on the table? Explain why.

What happens to electronegativity as you move across a row on the table? Explain why.

Stability and Electron Configuration.

Which atoms are stable? What is their configuration?

Why are other atoms unstable? What do they do to become stable?

Why do atoms form bonds? What kinds of bonds may be formed?