ସୀସା (English: Lead; ଲୀଡ୍) ହେଉଛି ଏକ ରାସାୟନିକ ମୌଳିକ ଯାହାର ପ୍ରତୀକ Pb (Latin: plumbum; ପ୍ଲମ୍ବମ୍ରୁ ଅସିଛି) ଓ ପରମାଣୁ କ୍ରମାଙ୍କ ୮୨ ।
Quick Facts ସାଧାରଣ ଗୁଣ, ନାମ, ପ୍ରତୀକ ...
Lead, 82Pb |
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| ନାମ, ପ୍ରତୀକ | lead, Pb |
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| Appearance | metallic gray |
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| ଉଚ୍ଚାରଣ | LED |
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| ପରମାଣୁ କ୍ରମାଙ୍କ (Z) | 82 |
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| ଶ୍ରେଣୀ, ବ୍ଳକ | group 14 (carbon group), p-block |
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| ପର୍ଯ୍ୟାୟ | period 6 |
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| ମୌଳିକ ପ୍ରକାର | post-transition metal |
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| ମାନକ ପରମାଣବିକ ଓଜନ (Ar) | 207.2 |
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| ଇଲେକ୍ଟ୍ରୋନ୍ ବିନ୍ୟାସ | [Xe] 4f14 5d10 6s2 6p2 |
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per shell | 2, 8, 18, 32, 18, 4 |
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| ଅବସ୍ଥା | solid |
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| ଗଳନାଙ୍କ | 600.61 K (327.46 °C, 621.43 °F) |
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| ସ୍ଫୁଟନାଙ୍କ | 2022 K (1749 °C, 3180 °F) |
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| Density near r.t. | 11.34 g/cm3 |
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| when liquid, at m.p. | 10.66 g/cm3 |
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| Heat of fusion | 4.77 kJ/mol |
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| Heat of | 179.5 kJ/mol |
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| Molar heat capacity | 26.650 J/(mol·K) |
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pressure
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
978 |
1088 |
1229 |
1412 |
1660 |
2027 |
|
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| Oxidation states | 4, 3, 2, 1
(Amphoteric oxide) |
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| Electronegativity | Pauling scale: 2.33 |
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| Atomic radius | empirical: 175 pm |
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| Covalent radius | 146±5 pm |
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| Van der Waals radius | 202 pm |
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| Crystal structure | face-centered cubic (fcc) |
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| Speed of sound thin rod | (annealed)
1190 m/s (at r.t.) |
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| Thermal expansion | 28.9 µm/(m·K) (at 25 °C) |
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| Thermal conductivity | 35.3 W/(m·K) |
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| Electrical resistivity | 208 n Ω·m (at 20 °C) |
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| Magnetic ordering | diamagnetic |
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| Young's modulus | 16 GPa |
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| Shear modulus | 5.6 GPa |
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| Bulk modulus | 46 GPa |
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| Poisson ratio | 0.44 |
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| Mohs hardness | 1.5 |
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| Brinell hardness | 38.3 MPa |
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| CAS Number | 7439-92-1 |
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| ଆବିଷ୍କାର | Middle Easterns (7000 BC) |
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|
| iso |
NA |
half-life |
DM |
DE (MeV) |
DP |
| 204Pb |
1.4% |
>1.4×1017 y |
α |
1.972 |
200Hg |
| 205Pb |
syn |
1.53×107 y |
ε |
0.051 |
205Tl |
| 206Pb |
24.1% |
206Pb is stable with 124 neutrons |
| 207Pb |
22.1% |
207Pb is stable with 125 neutrons |
| 208Pb |
52.4% |
>2×1019 y |
α |
0.5188 |
204Hg |
| 210Pb |
trace |
22.3 y |
α |
3.792 |
206Hg |
| β− |
0.064 |
210Bi |
|
| | references |
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