Group 1 Elements - By: Sarah, Sam, and Rob

The Group 1 Elements are located in the first column of the periodic table. They include the elements Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium, and are also known as the Alkali metals.

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Properties: The Group 1 Elements are mostly soft and silver-colored metals. They have both low densities and low melting and boiling points. Since they are metals, they are good conductors of heat, malleable, and ductile. Alkali metals are also known as the most reactive elements. This is because of their low ionization energies.
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Individual Properties:
Lithium (Li) -
Atomic Number: 3 Melting Point: 180.54°
Atomic Mass: 6.94 Boiling Point: 1342°
Density: 0.543 g/cm^3

Sodium (Na) -Atomic Number: 11 Melting Point: 97.72°
Atomic Mass: 22.99 Boiling Point: 883°
Density: 0.968 g/cm^3

Potassium (K) -
Atomic Number: 19 Melting Point: 63. 38°
Atomic Mass: 39.10 Boiling Point: 759°
Density: 0.89 g/cm^3

Rubidium (Rb) -
Atomic Number: 37 Melting Point: 39.31°
Atomic Mass: 85.47 Boiling Point: 688°
Density: 1.532 g/cm^3


Cesium (Cs) -
Atomic Number: 55 Melting Point: 28.44°
Atomic Mass: 132.91 Boiling Point: 671°
Density: 1.93 g/cm^3


Francium (Fr) -
Atomic Number: 87 Melting Point: 27° ?
Atomic Mass: (223) Boiling Point: 677° ?
Density: 1.87 g/cm^3 ?

No stable isotopes have been found for this element, estimations
Electron Configuration:
external image alkali-metals-electronic-configurations.gif

Flame Colors:
Lithium- Red
Sodium- Yellow
Potassium- Purple
Rubidium- Violet
Cesium- Blue
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Melting Point of the Metals:
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Periodic Trends:

  • All group one elements have one valence electron.
  • Down the group, ionization energy decreases.
  • Electronegativity decreases as you go down the group.
  • Melting point and boiling point also decreases as you go down the group.
  • Density, however, increases as you go down the group.
  • Atomic radius increases as you go down the group.

Interesting Facts:

Lithium is less dense than water
Cesium’s valence electron is so loosely bound that you can cause it to detach just by shining a light on it
sodium is so soft at room temperature that you can cut it with a butter knife
Pure potassium usually is stored under oil or kerosene because it oxidizes so readily in air and reacts in water
Potassium was the first element to be isolated using electrolysis


Questions:
1 What color does cesium burn?
a) pink
b) violet
c) blue
d) orange
e) indigo

2 What is a characteristic that all group one elements share?
a) they aren't malleable
b) they are nonmetals
c) they aren't shiny but they are metals
d) They have low densities
e) they are exceedingly rigid at room temp

3 which group one element would most likely catch on fire if it got in contact with water?
a) potassium
b) cesium
c) Cocuerium
d) Lithium
e) sodium

4 How would a group one element act in an ionic bond:
a) it wouldn't be in an ionic bond
b) it would lose an electron
c) it would gain an electron
d) none of the above

5 Which group one element has the smallest ionization energy?
a) Lithium
b)pottasium
c)Francium
d)rubidium
e) sodium



Works Cited:
"Alkali Metals." About.com Chemistry. N.p., n.d. Web. 27 Nov. 2012. http://chemistry.about.com/od/elementgroups/a/alkalimetals.htm.

"Alkali Metals." Student Resources for General Chemistry. N.p., n.d. Web. 27 Nov. 2012. <http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Group-IA-Alkali-Metals-544.html>.
"Alkali Metals Facts & Properties - Lithium Sodium Potassium Rubidium Caesium Francium." Alkali Metals Facts & Properties - Lithium Sodium Potassium Rubidium Caesium Francium. N.p., 23 Oct. 2012. Web. 27 Nov. 2012. <http://www.sciencekids.co.nz/sciencefacts/metals/alkalimetals.html>.
Berman, Kellie, and Nilshita Devi. "Group 1: The Alkali Metals." Chem Wiki. UC Davis, n.d. Web. 27 Nov. 2012. <http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descriptive_Chemistry/Main_Group_Elements/Group__1%3A_The_Alkali_Metals>.



"Group 1 Properties." BBC News. BBC, 2012. Web. 27 Nov. 2012. <http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/periodic_table/group1rev1.shtml>.

"Visual Elements: Group 1 - The Alkali Metals." Visual Elements: Group 1 - The Alkali Metals. N.p., n.d. Web. 27 Nov. 2012. <http://www.rsc.org/chemsoc/visualelements/pages/data/intro_groupi_data.html>.