hydrogen vs rubidium vs cesium

hydrogen (chemical element) | rubidium (chemical element) | cesium (chemical element)

Periodic table location

Images

| hydrogen | rubidium | cesium atomic symbol | H | Rb | Cs atomic number | 1 | 37 | 55 short electronic configuration | 1s^1 | [Kr]5s^1 | [Xe]6s^1 Aufbau diagram | 1s | 5s | 6s block | s | s | s group | 1 | 1 | 1 period | 1 | 5 | 6 atomic mass | 1.008 u | 85.4678 u | 132.90545196 u half-life | (stable) | (stable) | (stable)

| hydrogen | rubidium | cesium phase at STP | gas | solid | solid melting point | -259.14 °C | 39.31 °C | 28.44 °C boiling point | -252.87 °C | 688 °C | 671 °C critical temperature | 32.97 K | 2093 K | 1938 K critical pressure | 1.293 MPa | 16 MPa | 9.4 MPa molar heat of fusion | 0.558 kJ/mol | 2.19 kJ/mol | 2.09 kJ/mol molar heat of vaporization | 0.452 kJ/mol | 72 kJ/mol | 65 kJ/mol specific heat at STP | 14300 J/(kg K) | 364 J/(kg K) | 242 J/(kg K) adiabatic index | 7/5 | | (properties at standard conditions)

| hydrogen | rubidium | cesium density | 8.99×10^-5 g/cm^3 | 1.532 g/cm^3 | 1.879 g/cm^3 liquid density | | 1.46 g/cm^3 | 1.843 g/cm^3 molar volume | 11200 cm^3/mol | 55.79 cm^3/mol | 70.73 cm^3/mol Mohs hardness | | 0.3 (between talc and gypsum) | 0.2 (between talc and gypsum) Brinell hardness | | 0.216 MPa | 0.14 MPa bulk modulus | | 2.5 GPa | 1.6 GPa Young's modulus | | 2.4 GPa | 1.7 GPa refractive index | 1.000132 | | sound speed | 1270 m/s | 1300 m/s | thermal conductivity | 0.1805 W/(m K) | 58 W/(m K) | 36 W/(m K) (properties at standard conditions)

| hydrogen | rubidium | cesium electrical type | | conductor | conductor resistivity | | 1.2×10^-7 Ω m (ohm meters) | 2×10^-7 Ω m (ohm meters) electrical conductivity | | 8.3×10^6 S/m (siemens per meter) | 5×10^6 S/m (siemens per meter) magnetic type | diamagnetic | paramagnetic | paramagnetic volume magnetic susceptibility | -2.23×10^-9 | 3.98×10^-6 | 5.26×10^-6 mass magnetic susceptibility | -2.48×10^-8 m^3/kg (cubic meters per kilogram) | 2.6×10^-9 m^3/kg (cubic meters per kilogram) | 2.8×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -4.999×10^-11 m^3/mol (cubic meters per mole) | 2.22×10^-10 m^3/mol (cubic meters per mole) | 3.72×10^-10 m^3/mol (cubic meters per mole) work function | | 2.26 eV (Polycrystalline) | 1.95 eV (Polycrystalline) threshold frequency | | 5.467×10^14 Hz (hertz) | 4.715×10^14 Hz (hertz) color | (colorless) | (silver) | (yellow) refractive index | 1.000132 | |

| hydrogen | rubidium | cesium valence | 1 | 1 | 1 electronegativity | 2.2 | 0.82 | 0.79 electron affinity | 72.8 kJ/mol (kilojoules per mole) | 46.9 kJ/mol (kilojoules per mole) | 45.5 kJ/mol (kilojoules per mole) first ionization energy | 1312 kJ/mol (kilojoules per mole) | 403 kJ/mol (kilojoules per mole) | 375.7 kJ/mol (kilojoules per mole) ionization energies | 1312 kJ/mol | 403 kJ/mol | 2633 kJ/mol | 3860 kJ/mol | 5080 kJ/mol | 6850 kJ/mol | 8140 kJ/mol | 9570 kJ/mol | 13120 kJ/mol | 14500 kJ/mol | 26740 kJ/mol | 375.7 kJ/mol | 2234.3 kJ/mol | 3400 kJ/mol

Reactivity

| hydrogen | rubidium | cesium term symbol | ^2S_(1/2) | ^2S_(1/2) | ^2S_(1/2) atomic radius | 25 pm | 235 pm | 260 pm covalent radius | 31 pm | 220 pm | 244 pm van der Waals radius | 120 pm | | (electronic ground state properties)

| hydrogen | rubidium | cesium universe abundance | 75 mass% | 1×10^-6 mass% | 8×10^-8 mass% solar abundance | 75 mass% | 3×10^-6 mass% | 8×10^-7 mass% meteorite abundance | 2.4 mass% | 3.2×10^-4 mass% | 1.4×10^-5 mass% crust abundance | 0.15 mass% | 0.006 mass% | 1.9×10^-4 mass% ocean abundance | 11 mass% | 1.2×10^-5 mass% | 5×10^-8 mass% human abundance | 10 mass% | 4.6×10^-4 mass% | 2×10^-6 mass% universe molar abundance | 93 mol% | 1×10^-8 mol% | 1×10^-9 mol% solar molar abundance | 93 mol% | 4×10^-8 mol% | 7×10^-9 mol% meteorite molar abundance | 17 mol% | 7.8×10^-5 mol% | 2×10^-6 mol% ocean molar abundance | 66 mol% | 8.7×10^-7 mol% | 2.3×10^-9 mol% crust molar abundance | 3.1 mol% | 0.0014 mol% | 2.9×10^-5 mol% human molar abundance | 62 mol% | 3.4×10^-5 mol% | 1×10^-7 mol%

| hydrogen | rubidium | cesium half-life | (stable) | (stable) | (stable) stable isotopes | H-1 (99.985%) | H-2 (1.5×10^-4) | Rb-85 (72.17%) | Cs-133 (100%) nuclear spin | H-1: 1/2^+ | H-2: 1^+ | H-3: 1/2^+ | H-4: 2^- | H-5: 1/2^+ | H-6: 2^- | H-7: 1/2^+ | Rb-71: 5/2^- | Rb-72: 3^+ | Rb-73: 3/2^- | Rb-74: 0^+ | Rb-75: 3/2^- | Rb-76: 1^- | Rb-77: 3/2^- | Rb-78: 0^+ | Rb-79: 5/2^+ | Rb-80: 1^+ | Rb-81: 3/2^- | Rb-82: 1^+ | Rb-83: 5/2^- | Rb-84: 2^- | Rb-85: 5/2^- | Rb-86: 2^- | Rb-87: 3/2^- | Rb-88: 2^- | Rb-89: 3/2^- | Rb-90: 0^- | Rb-91: 3/2^- | Rb-92: 0^- | Rb-93: 5/2^- | Rb-94: 3^- | Rb-95: 5/2^- | Rb-96: 2^- | Rb-97: 3/2^+ | Rb-99: 5/2^+ | Rb-101: 3/2^+ | Cs-113: 3/2^+ | Cs-114: 1^+ | Cs-115: 9/2^+ | Cs-116: 1^+ | Cs-117: 9/2^+ | Cs-118: 2^? | Cs-119: 9/2^+ | Cs-120: 2^+ | Cs-121: 3/2^+ | Cs-122: 1^+ | Cs-123: 1/2^+ | Cs-124: 1^+ | Cs-125: 1/2^+ | Cs-126: 1^+ | Cs-127: 1/2^+ | Cs-128: 1^+ | Cs-129: 1/2^+ | Cs-130: 1^+ | Cs-131: 5/2^+ | Cs-132: 2^+ | Cs-133: 7/2^+ | Cs-134: 4^+ | Cs-135: 7/2^+ | Cs-136: 5^+ | Cs-137: 7/2^+ | Cs-138: 3^- | Cs-139: 7/2^+ | Cs-140: 1^- | Cs-141: 7/2^+ | Cs-142: 0^- | Cs-143: 3/2^+ | Cs-144: 1^- | Cs-145: 3/2^+ | Cs-146: 1^- | Cs-147: 3/2^+ | Cs-149: 3/2^+ | Cs-151: 3/2^+ unstable isotopes | H-3 (12.32 yr) | H-6 (0.29 zs) | H-4 (0.139 zs) | H-5 (0.08 zs) | H-7 (0.023 zs) | Rb-87 (48.1 Gyr) | Rb-83 (86.2 days) | Rb-84 (33.1 days) | Rb-86 (18.642 days) | Rb-81 (4.57 h) | Rb-79 (22.9 min) | Rb-88 (17.773 min) | Rb-78 (17.66 min) | Rb-89 (15.15 min) | Rb-77 (226 s) | Rb-90 (158 s) | Rb-82 (76.38 s) | Rb-91 (58.4 s) | Rb-76 (36.5 s) | Rb-80 (33.4 s) | Rb-75 (19 s) | Rb-93 (5.84 s) | Rb-92 (4.492 s) | Rb-94 (2.702 s) | Rb-95 (377.5 ms) | Rb-96 (203 ms) | Rb-97 (169.9 ms) | Rb-98 (114 ms) | Rb-74 (64.76 ms) | Rb-99 (50.3 ms) | Rb-100 (51 ms) | Rb-102 (37 ms) | Rb-101 (32 ms) | Rb-72 (1.2 µs) | Rb-73 (30 ns) | Cs-135 (2.3 Myr) | Cs-137 (30.08 yr) | Cs-134 (2.0652 yr) | Cs-136 (13.04 days) | Cs-131 (9.689 days) | Cs-132 (6.479 days) | Cs-129 (32.06 h) | Cs-127 (6.25 h) | Cs-125 (46.7 min) | Cs-138 (33.42 min) | Cs-130 (29.22 min) | Cs-139 (9.27 min) | Cs-123 (5.87 min) | Cs-128 (220 s) | Cs-121 (155 s) | Cs-126 (98.4 s) | Cs-140 (63.7 s) | Cs-120 (61.2 s) | Cs-119 (43 s) | Cs-124 (30.9 s) | Cs-141 (24.84 s) | Cs-122 (21.18 s) | Cs-118 (14 s) | Cs-117 (8.4 s) | Cs-143 (1.791 s) | Cs-142 (1.684 s) | Cs-115 (1.4 s) | Cs-144 (0.994 s) | Cs-116 (700 ms) | Cs-145 (587 ms) | Cs-114 (570 ms) | Cs-146 (321 ms) | Cs-147 (235 ms) | Cs-148 (146 ms) | Cs-151 (50 ms) | Cs-150 (50 ms) | Cs-149 (50 ms) | Cs-112 (500 µs) | Cs-113 (16.7 µs) neutron cross-section | 0.332 b | 0.38 b | 29 b neutron mass absorption | 0.011 m^2/kg | 3×10^-4 m^2/kg | 0.0077 m^2/kg

| hydrogen | rubidium | cesium CAS number | 1333-74-0 | 7440-17-7 | 7440-46-2 PubChem CID number | 783 | 5357696 | 5354618