Group exit: 2 Block: s normal Properties: * Two negatrons in the outer shell * Low electron affinities * Low electronegativities * Readily course divalent cations. Discovery Dates: beryllium: unaffectionate in 1828 by Wöhler Magnesium: accepted as an element in 1775, marooned in virgin 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 - total heat /kJ mol-1 1st 589.8 2nd 1145.4 tertiary 4912.4 4th 6491 5th 8153 sixth 10496 7th 12270 8th 14206 9th 18191 tenth 20385 11th 57110 12th 63410 thirteenth 70110 14th 78890 15th 86310 sixteenth 94000 17th 104900 18th 111710 nineteenth 494850 20th 527760 nuclear Number: 20 nuclear Radii: atomic radius (empirical): 180 pm atomic radius (calculated): 194 pm negatron likeness: 2.37 kJ mol-1 negativeness Value in Pauling units Pauling negativity 1.00 Sanderson electronegativity 0.95 Allred Rochow electronegativity 1.04 Mulliken-Jaffe electronegativity 1.08 (sp orbital) Allen electronegativity 1.
034 Lewis Electron fare Diagram: Ca Valence Shell Electron accord: 1s22s22p63s23p64s2 Noble Gas Abbreviation: [Ar] 4s2 Metallic Character: * Grey, argent metal * Rather hard * Rather reactive * It promptly forms a white destination of calcium nitride in send off * It reacts with water and the metal burns with a yellow-red flame Atomic Number: 12 Ato mic radius (empirical): 150 pm Atomic radiu! s (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...If you want to get a broad essay, order it on our website:
BestEssayCheap.comIf you want to get a full essay, visit our page:
cheap essay
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.