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Earth Metals Essay

  • Submitted by: sushilvr0488
  • on January 6, 2013
  • Category: Arts and Music
  • Length: 343 words

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Below is an essay on "Earth Metals" from Anti Essays, your source for research papers, essays, and term paper examples.

Group Number: 2

Block: s

Common Properties:
  * Two electrons in the outer shell
  * Low electron affinities
  * Low electronegativities
  * Readily form divalent cations.

Discovery Dates:
Beryllium: isolated in 1828 by Wöhler
Magnesium: recognized as an element in 1775, isolated in pure form by Davy in 1805
Calcium: isolated in 1808 by Davy
Strontium: isolated in 1808 by Davy
Barium: isolated in 1808 by Davy
Radium: discovered and isolated in 1911 by Marie Curie.

Ionization energy number - Enthalpy /kJ mol-1
1st 589.8
2nd 1145.4
3rd 4912.4
4th 6491
5th 8153
6th 10496
7th 12270
8th 14206
9th 18191
10th 20385
11th 57110
12th 63410
13th 70110
14th 78890
15th 86310
16th 94000
17th 104900
18th 111710
19th 494850
20th 527760

Atomic Number: 20

Atomic Radii:
Atomic radius (empirical): 180 pm
Atomic radius (calculated): 194 pm

Electron Affinity: 2.37 kJ mol-1

Electronegativity         Value in Pauling units
Pauling electronegativity               1.00
Sanderson electronegativity 0.95
Allred Rochow electronegativity 1.04
Mulliken-Jaffe electronegativity 1.08 (sp orbital)
Allen electronegativity             1.034

Lewis Electron Dot Diagram: Ca

Valence Shell Electron Configuration: 1s22s22p63s23p64s2
Noble Gas Abbreviation: [Ar] 4s2

Metallic Character:
  * Grey, silvery metal
  * Rather hard
  * Rather reactive
  * It readily forms a white coating of calcium nitride in air
  * It reacts with water and the metal burns with a yellow-red flame

Atomic Number: 12

Atomic radius (empirical): 150 pm
Atomic radius (calculated): 145 pm

Electron Affinity:   0 kJ mol-1

Electronegativity                 Value in Pauling units
Pauling electronegativity             1.31
Sanderson electronegativity             1.32
Allred Rochow electronegativity 1.23
Mulliken-Jaffe electronegativity           1.37 (sp orbital)
Allen electronegativity...

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"Earth Metals". Anti Essays. 13 Dec. 2018

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Earth Metals. Anti Essays. Retrieved December 13, 2018, from the World Wide Web: http://parimatch-stavka7.com/free-essays/Earth-Metals-383428.html


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