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Barium(Ba) | Beryllium(Be) | Calcium(Ca) | Magnesium(Mg) | Radium(Ra) |
|---|---|---|---|---|---|
| Atomic weight | 137.33 | 9.012 | 40.08 | 24.305 | 226.025 |
| Atomic volume | 39.24 (cm3/mol) | 5. (cm3/mol) | 29.9 (cm3/mol) | 13.97 (cm3/mol) | 45.2 (cm3/mol) |
| discovered | 11/30/1807 | 11/30/1796 | 11/30/1807 | 11/30/1807 | 11/30/1897 |
| state (s, l, g) | s | s | s | s | s |
| melting point | 998.2 (K) | 1,551.2 (K) | 1,112.2 (K) | 922 (K) | 973.2 (K) |
| boiling point | 2,123 (K) | 2,773 (K) | 1,767 (K) | 1,378 (K) | 1,973 (K) |
| electronegativity | .89 | 1.57 | 1 | 1.31 | .9 |
| Shells | 2,8,18,18,8,2 | 2,2 | 2,8,8,2 | 2,8,2 | 2,8,18,32,18,8,2 |
| electron configuration | [Xe] 6s2 | [He] 2s2 | [Ar] 4s2 | [Ne] 3s2 | [Rn] 7s2 |
| structure | bcc: body-centered cubic | hcp: hexagonal close pkd | hcp: hexagonal close pkd | hcp: hexagonal close pkd | bcc: body-centered cubic |
| uses | X-ray imaging agnt(BaSO4) | Cu alloys, X-ray windows | lime, cement | alloys, flash bulbs | neutron source |
| toxicity | ... | yes | ... | ... | ... |
| hardness | ... | ... | 1.5 (mohs) | 2 (mohs) | ... |
| characteristics | soft | toxic | burns brightly | burns brightly | Radioactive, luminescent |
| reaction with air | vigorous,wt/ht=>BaO,Ba2N3 | vigorous, w/ht=>BeO,Be3N2 | vigorous, =>CaO, Ca3N2 | vigorous,w/ht =>MgO,Mg3N2 | vigorous, =>RaO2, Ra3N2 |
| number of isotopes | 7 | 1 | 6 | 3 | 4 |
| hydride(s) | BaH2 | BeH2 | CaH2 | MgH2 | ... |
| oxide(s) | BaO | BeO | CaO | MgO | ... |
| chloride(s) | BaCl2 | BeCl2 | CaCl2 | MgCl2 | RaCl2 |
| image |  |  |  |  |  |
| thermal conductivity | 18.4 J/m-sec-deg | 201 J/m-sec-deg | 201 J/m-sec-deg | 156 J/m-sec-deg | 18.6 J/m-sec-deg |
| electrical conductivity | 1/mohm-cm | 250 1/mohm-cm | 255.754 1/mohm-cm | 224.719 1/mohm-cm | 1/mohm-cm |
| polarizability | 39.7 (A^3) | 5.6 (A^3) | 22.8 (A^3) | 10.6 (A^3) | 38.3 (A^3) |
| source | Barite (sulfate) | Beryl (silicate) | Calcite (oxide) | Seawater, magnesite | ... |
| abundance earth's crust | 2.6 (log) | .4 (log) | 4.65 (log) | 4.4 (log) | -6 (log) |
| cost, pure | 55 $/100g | 530 $/100g | 11 $/100g | 3.7 $/100g | $/100g |
| cost, bulk | $/100g | 59 $/100g | $/100g | 0.32 $/100g | $/100g |
| rel. abund. solar system | 0 | - (-) | 4 (4) | 6 (6) | l (l) |
| Density @ 293 K | 3 (3) | 1 (1) | 1 (1) | 1 (1) | 5 (5) |
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