Hydrogen vs Argon
Side-by-side comparison of Hydrogen (H, element 1) and Argon (Ar, element 18) by atomic structure and physical properties.
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| Atomic number | 1 | 18 |
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| Symbol | H | Ar |
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| Name | Hydrogen | Argon |
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| Category | nonmetal | noble-gas |
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| Standard Atomic Weight | 1.007975 u | 39.948 u |
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| Period | 1 | 3 |
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| Group | 1 | 18 |
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| Block | s | p |
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| Phase at STP | Gas | Gas |
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| Electron configuration | 1s1 | [Ne]3s23p6 |
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| Oxidation states | [-1, 1] | [0] |
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| Electronegativity (Pauling) | 2.2 | N/A |
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| Electron affinity | 0.75419 eV | -1 eV |
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| Density | 0.08988 kg/m³ | 1.7837 kg/m³ |
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| Melting point | -259.193 °C | -189.35 °C |
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| Boiling point | -252.781 °C | -185.85 °C |
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| Discovery year | 1766 | 1894 |
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Key Differences
| H Hydrogen | Ar Argon |
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| Standard Atomic Weight | 1.007975 u ↓ lower | 39.948 u ↑ higher |
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| Density | 0.08988 kg/m³ ↓ lower | 1.7837 kg/m³ ↑ higher |
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| Melting point | -259.193 °C ↓ lower | -189.35 °C ↑ higher |
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| Boiling point | -252.781 °C ↓ lower | -185.85 °C ↑ higher |
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| Electron affinity | 0.75419 eV ↑ higher | -1 eV ↓ lower |
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| Period | 1 | 3 |
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| Group | 1 | 18 |
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| Block | s | p |
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| Category | nonmetal | noble-gas |
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| Electron configuration | 1s1 | [Ne]3s23p6 |
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| Discovery year | 1766 | 1894 |
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