name of helium vs krypton

helium (chemical element) | krypton (chemical element)

Periodic table location

Images

| helium | krypton atomic symbol | He | Kr atomic number | 2 | 36 short electronic configuration | 1s^2 | [Ar]4s^23d^104p^6 Aufbau diagram | 1s | 4p 3d 4s block | s | p group | 18 | 18 period | 1 | 4 atomic mass | 4.002602 u | 83.798 u half-life | (stable) | (stable)

| helium | krypton phase at STP | gas | gas melting point | | -157.36 °C boiling point | -268.93 °C | -153.22 °C critical temperature | 5.19 K | 209.41 K critical pressure | 0.227 MPa | 5.5 MPa molar heat of fusion | 0.02 kJ/mol | 1.64 kJ/mol molar heat of vaporization | 0.083 kJ/mol | 9.02 kJ/mol specific heat at STP | 5193.1 J/(kg K) | 248.05 J/(kg K) adiabatic index | 5/3 | 5/3 (properties at standard conditions)

| helium | krypton density | 1.785×10^-4 g/cm^3 | 0.00375 g/cm^3 molar volume | 22420 cm^3/mol | 22300 cm^3/mol refractive index | 1.000035 | 1.000427 sound speed | 970 m/s | 1120 m/s thermal conductivity | 0.1513 W/(m K) | 0.00943 W/(m K) (properties at standard conditions)

| helium | krypton magnetic type | diamagnetic | diamagnetic volume magnetic susceptibility | -1.05×10^-9 | -1.65×10^-8 mass magnetic susceptibility | -5.9×10^-9 m^3/kg (cubic meters per kilogram) | -4.4×10^-9 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -2.36×10^-11 m^3/mol (cubic meters per mole) | -3.69×10^-10 m^3/mol (cubic meters per mole) color | (colorless) | (colorless) refractive index | 1.000035 | 1.000427

| helium | krypton valence | 0 | 2 electronegativity | | 3 electron affinity | 0 kJ/mol (kilojoules per mole) | 0 kJ/mol (kilojoules per mole) first ionization energy | 2372.3 kJ/mol (kilojoules per mole) | 1350.8 kJ/mol (kilojoules per mole) ionization energies | 2372.3 kJ/mol | 5250.5 kJ/mol | 1350.8 kJ/mol | 2350.4 kJ/mol | 3565 kJ/mol | 5070 kJ/mol | 6240 kJ/mol | 7570 kJ/mol | 10710 kJ/mol | 12138 kJ/mol | 22274 kJ/mol | 25880 kJ/mol | 29700 kJ/mol | 33800 kJ/mol | 37700 kJ/mol | 43100 kJ/mol | 47500 kJ/mol | 52200 kJ/mol | 57100 kJ/mol | 61800 kJ/mol | 75800 kJ/mol | 80400 kJ/mol | 85300 kJ/mol

Reactivity

| helium | krypton term symbol | ^1S_0 | ^1S_0 atomic radius | 31 pm | 88 pm covalent radius | 28 pm | 116 pm van der Waals radius | 140 pm | 202 pm (electronic ground state properties)

| helium | krypton universe abundance | 23 mass% | 4×10^-6 mass% solar abundance | 23 mass% | crust abundance | 5.5×10^-7 mass% | 1.5×10^-8 mass% ocean abundance | 7.2×10^-10 mass% | 2.1×10^-8 mass% universe molar abundance | 7.2 mol% | 6×10^-8 mol% solar molar abundance | 7.4 mol% | ocean molar abundance | 1.1×10^-9 mol% | 1.6×10^-9 mol% crust molar abundance | 3×10^-6 mol% | 4×10^-9 mol%

| helium | krypton half-life | (stable) | (stable) stable isotopes | He-4 (99.999863%) | He-3 (1.37×10^-6) | Kr-84 (57%) | Kr-86 (17.3%) | Kr-82 (11.58%) | Kr-83 (11.49%) | Kr-80 (2.28%) | Kr-78 (0.35%) nuclear spin | He-3: 1/2^+ | He-4: 0^+ | He-5: 3/2^- | He-6: 0^+ | He-7: 3/2^- | He-8: 0^+ | He-9: 1/2^+ | He-10: 0^+ | Kr-69: 5/2^- | Kr-70: 0^+ | Kr-71: 5/2^- | Kr-72: 0^+ | Kr-73: 3/2^- | Kr-74: 0^+ | Kr-75: 5/2^+ | Kr-76: 0^+ | Kr-77: 5/2^+ | Kr-78: 0^+ | Kr-79: 1/2^- | Kr-80: 0^+ | Kr-81: 7/2^+ | Kr-82: 0^+ | Kr-83: 9/2^+ | Kr-84: 0^+ | Kr-85: 9/2^+ | Kr-86: 0^+ | Kr-87: 5/2^+ | Kr-88: 0^+ | Kr-89: 3/2^+ | Kr-90: 0^+ | Kr-91: 5/2^+ | Kr-92: 0^+ | Kr-93: 1/2^+ | Kr-94: 0^+ | Kr-95: 1/2^+ | Kr-96: 0^+ | Kr-97: 3/2^+ | Kr-98: 0^+ | Kr-99: 3/2^+ | Kr-100: 0^+ unstable isotopes | He-6 (806.7 ms) | He-8 (119 ms) | He-9 (7 zs) | He-7 (3.04 zs) | He-10 (1.52 zs) | He-5 (0.76 zs) | Kr-81 (0.229 Myr) | Kr-85 (10.731 yr) | Kr-79 (35.04 h) | Kr-76 (14.8 h) | Kr-88 (170 min) | Kr-87 (76.33 min) | Kr-77 (74.33 min) | Kr-74 (11.5 min) | Kr-75 (4.28 min) | Kr-89 (189 s) | Kr-90 (32.32 s) | Kr-73 (27.3 s) | Kr-72 (17.1 s) | Kr-91 (8.57 s) | Kr-92 (1.84 s) | Kr-93 (1.286 s) | Kr-94 (212 ms) | Kr-95 (114 ms) | Kr-71 (100 ms) | Kr-96 (80 ms) | Kr-97 (63 ms) | Kr-70 (52 ms) | Kr-98 (46 ms) | Kr-99 (40 ms) | Kr-69 (32 ms) | Kr-100 (300 ns) neutron cross-section | 0.007 b | 25 b neutron mass absorption | 1×10^-5 m^2/kg | 0.013 m^2/kg

| helium | krypton CAS number | 7440-59-7 | 7439-90-9 PubChem CID number | 23987 | 5416 Gmelin number | | 16201