A320506 - OEIS

A320506

First ionization energy (in kJ/mol) of the chemical elements, rounded to the nearest integer.

1312, 2372, 520, 900, 801, 1087, 1402, 1314, 1681, 2081, 496, 738, 578, 787, 1012, 1000, 1251, 1521, 419, 590, 633, 659, 651, 653, 717, 763, 760, 737, 746, 906, 579, 762, 947, 941, 1140, 1351, 403, 550, 600, 640, 652, 684, 702, 710, 720, 804, 731, 868, 558, 709, 834, 869, 1008, 1170, 376, 503, 538, 534, 527, 533, 540, 545, 547, 593, 566, 573, 581, 589, 597, 603, 524, 659, 761, 770, 760, 840, 880, 870, 890, 1007, 589, 716, 703, 812, 899, 1037, 380, 509, 499, 587, 568, 598, 605, 585, 578, 581, 601, 608, 619, 627, 635, 642, 470, 580

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OFFSET

1,1

COMMENTS

The first ionization energy of an element X is the enthalpy change of X (g) -> X+ (g) + e-.

The values for chemical elements in each period (1 - 2, 3 - 10, 11 - 18, 19 - 36, 37 - 54, 55 - 86) are overall increasing, with boron group elements (boron, aluminum, gallium, indium, thallium) having relative low first ionization energies comparing with their nearby elements.

LINKS

Table of n, a(n) for n=1..104.

NIST Atomic Spectra Database, Ionization Energies Form

Wikipedia, Ionization energies of the elements (data page)

EXAMPLE

The first ionization energies for hydrogen (1), helium (2) and lithium (3), etc. are 1312.0 kJ/mol, 2372.3 kJ/mol, 520.2 kJ/mol, etc.

CROSSREFS

Cf. A320507.

Sequence in context: A248202 A256668 A205301 * A322834 A295562 A030646

Adjacent sequences: A320503 A320504 A320505 * A320507 A320508 A320509

KEYWORD

nonn,look

AUTHOR

Jianing Song, Oct 13 2018

STATUS

approved