Periodic Table Project

Periodic Group 2

By: Austin A, Manuel P and Justin N

Alkaline Earth Metals

The Elements for Group 2

Be 4 Protons/Electrons 5 Neutrons

MG 12 Protons/Electrons 12 Neutrons

Ca 20 Protons/Electrons 20 Neutrons

Sr 38 Protons/Electrons 55 Neutrons

Ba 56 Protons/Electrons 81 Neutrons

Ra 88 Protons/Electrons 138 Neutrons

Atomic Structure

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Average Atomic Mass

24Mg= 23.985042amu, 78.99%

25Mg= 24.985837 amu, 10.00%

26Mg= 25.982593, 11.01%





Ba= 137.33

Ra= 225.27

Bonding of Elements

Atomic Radii: It generally increases as you move down a group

Be- 112 pm Mg- 160 pm Ca-187pm Sr-215 pm Ba- 224 pm Ra-225 pm

Ionic Radii: As you move down a group, an ion's outer electrons are higher principal energy level

Be- 27 (2+)pm Mg- 72 (2+)pm Ca- 100 (2+)pm Sr- 116 (2+)pm Ba- 136 (2+)pm Ra- 152 (2+)pm

Reactivity: The Alkaline Earth Metals are different in their reactions compared to group I metals.

Radium is radioactive and is not considered in these reactions

-Hydrogen: All of the elements react with hydrogen to create metallic hydrides. Hydrides are mainly just compounds that involve hydrogen. Here is an example of a reaction:

Ca(s)+ H2(g) -------> CaH2(s)

-Oxygen: The alkaline earth metals reaact with oxygen to produce metal oxides. An oxide is just a compound involving oxygen. Be does not react with oxygen but otherwise all reactions are similar. Here is an example of a reaction:

Sr(s)+ O2 (g) -------> SrO2 (s)

-Nitrogen: These reactions cannot occur without extreme circumstances. For example, a compund may be created via really high temperatures. If they do react however, the equation would look similar to this:

3Mg(s) + N2(g)------> Mg3N2 (s)

-Halogens: When reacting with halogens, these metals creaate metal halides. Halide refers to a compund that is one part halogen, These reactions would look similar too:

Mg(s) + Cl2(g) ------> MgCl2(s)

-Water: Be is shown to not react with water, however Mg, Ca, Sr, and Ba do react to form hydroxides, or bases. These reactions can be genralized with an example:

Ba(s) + 2H2O (l) ------> Ba(OH)2(aq) + H2(g)

Electronegativity: It generally decreases as you move down a group

Be- 1.57


Ca- 1

Sr- 0.95

Ba- 0.89

Ra- 0.90

Ionization Energy: First ionization generally decreases as you move down a group

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Valance Electrons

Each Element from group 2 has 2 valance electrons

Beryllium- 2 Valance Electrons

Magnesium- 2 Valance Electrons

Calcium- 2 Valance Electrons

Strontium- 2 Valance Electrons

Barium- 2 Valance Electrons

Radium- 2 Valance Electrons

Electron Configuration

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Lewis Structure

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State of matter at room temperature 0r 25 degrees Celsius

On group 2 the Alkaline Earth Metals are elements that are solid

Boiling Point

Be- 1287 degrees Celsius

Mg-1090 degrees Celsius

Ca- 1484 degrees Celsius

Sr- 1382 degrees Celsius

Ba- 1897 degrees Celsius

Ra- 1140 degrees Celsius

Melting Point

Be- 1287 degrees Celsius

Mg- 650 degrees Celsius

Ca- 842 degrees Celsius

Sr- 777 degrees Celsius

Ba- 727 degrees Celsius

Ra- 700 degrees Celsius

Metals/ Nonmetals/ Metalloids

Beryllium, Magnesium, Calcium, Strontium, Barium, Radium are all metals


Bentor, Yinon. Chemical - Radium. Dec. 19, 2012 <>.

Bentor, Yinon. Chemical - Barium. Dec. 19, 2012 <>.

Bentor, Yinon. Chemical - Strontium. Dec. 19, 2012 <>.

Bentor, Yinon. Chemical - Calcium. Dec. 19, 2012 <>.

Bentor, Yinon. Chemical - Magnesium. Dec. 19, 2012 <>.

Bentor, Yinon. Chemical - Beryllium. Dec. 19, 2012 <>.