Electronic configurations of elements

List of Periodic Table Elements Sorted by Atomic Number

Atomic number: The number of protons in an atom. Each element is uniquely defined by its atomic number.

Atomic mass: The mass of an atom is primarily determined by the number of protons and neutrons in its nucleus. Atomic mass is measured in Atomic Mass Units (amu) which are scaled relative to carbon, ¹²C, that is taken as a standard element with an atomic mass of 12. This isotope of carbon has 6 protons and 6 neutrons. Thus, each proton and neutron has a mass of about 1 amu.

Isotope: Atoms of the same element with the same atomic number, but different number of neutrons. Isotope of an element is defined by the sum of the number of protons and neutrons in its nucleus. Elements have more than one isotope with varying numbers of neutrons. For example, there are two common isotopes of carbon, ¹²C and ¹³C which have 6 and 7 neutrons respectively. The abundances of different isotopes of elements vary in nature depending on the source of materials. For relative abundances of isotopes in nature see reference on Isotopic Composition of the Elements.

Atomic weight: Atomic weight values represent weighted average of the masses of all naturally occurring isotopes of an element. The values shown here are based on the IUPAC Commission determinations (Pure Appl. Chem. 73:667-683, 2001). The elements marked with an asterisk have no stable nuclides. For these elements the weight value shown represents the mass number of the longest-lived isotope of the element.

Electron configuration: The distribution of electrons according to the energy sublevels (subshells) in uncharged atoms. The noble gas shown in square brackets (e.g. [He]), marks that all the subshells associated with that element are fully occupied by electrons. .

Energy levels and sublevels

Principal energy level (Quantum number: n)	Sublevels available (Quantum number: l)
1 2 3 4 5 6	1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 5g 6s 6p 6d 6f 6g 6h

Ionization energy (IE): The energy required to remove the outermost electron from an atom or a positive ion in its ground level. The table lists only the first IE in eV units. To convert to kJ/mol multiply by 96.4869. Reference: NIST Reference Table on Ground levels and ionization energies for the neutral atoms. IE decreases going down a column of the periodic table, and increases from left to right in a row. Thus, alkali metals have the lowest IE in a period and Rare gases have the highest.

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List of the valence of elements

List of Periodic Table Elements Sorted by Atomic Number

Electronic Configurations of elements in periodic table

1 -

1.Hydrogen: 1s1	2 - Helium: 1s2
3 – Lithium: [He], 2s1	4 – Beryllium: [He], 2s2
5 – Boron: [He], 2s2, 2p1	6 – Carbon: [He], 2s2, 2p2
7 – Nitrogen: [He], 2s2, 2p3	8 – Oxygen: [He], 2s2, 2p4
9 – Fluorine: [He], 2s2, 2p5	10 – Neon: [He], 2s2, 2p6
11 - Sodium: [Ne], 3s1	12 - Magnisium: [Ne], 3s2
13 – Aluminum: [Ne], 3s2, 3p1	14 – Silicon: [Ne], 3s2, 3p2
15 – Phosphorus: [Ne], 3s2, 3p3	16 – Sulfur: [Ne], 3s2, 3p4
17 – Chlorine: [Ne], 3s2, 3p5	18 - Argon: [Ne], 3s2, 3p6
19 – Potassium: [Ar], 4s1	20 – Calcium: [Ar], 4s2
21 – Scandium: [Ar], 4s2, 4d1	22 – Titanium: [Ar], 4s2, 4d2
23 – Vanadium: [Ar], 4s2, 4d3	24 – Chromium: [Ar], 4s2, 4d4
25 – Manganese: [Ar], 4s2, 4d5	26 – Iron: [Ar], 4s2, 4d6
27 – Cobalt: [Ar], 4s2, 4d7	28 – Nickel: [Ar], 4s2, 4d8
29 – Copper: [Ar], 4s2, 4d9	30 – Zinc: [Ar], 4s2, 4d10
31 – Gallium: [Ar], 4s2, 4d10, 4p1	32 – Germanium: [Ar], 4s2, 4d10, 4p2
33 – Arsenic: [Ar], 4s2, 4d10, 4p3	34 – Selenium: [Ar], 4s2, 4d10, 4p4
35 – Bromine: [Ar], 4s2, 4d10, 4p5	36 – Krypton: [Ar], 4s2, 4d10, 4p6
37 – Rubidium: [Kr], 5s1	38 – Strontium: [Kr], 5s2
39 – Yttrium: [Kr], 5s2, 3d1	40 – Zirconium: [Kr], 5s2, 3d2
41 – Niobium: [Kr], 5s2, 4d3	42 – Molybdenum: [Kr], 5s2, 4d4
43 – Technetium: [Kr], 5s2, 4d5	44 – Ruthenium: [Kr], 5s2, 4d6
45 – Rhodium: [Kr], 5s2, 4d7	46 – Palladium: [Kr], 5s2, 4d8
47 – Silver: [Kr], 5s2, 4d9	48 – Cadmium: [Kr], 5s2, 4d10
49 – Indium: [Kr], 5s2, 4d10, 5p1	50 – Tin: [Kr], 5s2, 4d10, 5p2
51 – Antimony: [Kr], 5s2, 4d10, 5p3	52 – Tellurium: [Kr], 5s2, 4d10, 5p4
53 – Iodine: [Kr], 5s2, 4d10, 5p5	54 – Xenon: [Kr], 5s2, 4d10, 5p6
55 – Cesium: [Xe], 4f1	56 – Barium: [Xe], 4f2
57 – Lanthanum: [Xe], 4f3	58 – Cerium: [Xe], 4f4
59 – Praseodymium: [Xe], 4f5	60 – Neodymium: [Xe], 4f6
61 – Promethium: [Xe], 4f7	62 – Samarium: [Xe], 4f8
63 – Europium: [Xe], 4f9	64 – Gadolinium: [Xe], 4f10
65 – Terbium: [Xe], 4f11	66 – Dysprosium: [Xe], 4f12
67 – Holmium: [Xe], 4f13	68 – Erbium: [Xe], 4f14
69 – Thulium: [Xe], 4f14, 5d1	70 – Ytterbium: [Xe], 4f14, 5d2
71 – Lutetium: [Xe], 4f14, 5d3	72 – Hafnium: [Xe], 4f14, 5d4
73 – Tantalum: [Xe], 4f14, 5d5	74 – Tungsten: [Xe], 4f14, 5d6
75 – Rhenium: [Xe], 4f14, 5d7	76 – Osmium: [Xe], 4f14, 5d8
77 – Iridium: [Xe], 4f14, 5d9	78 – Platinum: [Xe], 4f14, 5d10
79 – Gold: [Xe], 4f14, 5d10, 6s1	80 – Mercury: [Xe], 4f14, 5d10, 6s2
81 – Thallium: [Xe], 4f14, 5d10, 6s2, 6p1	82 – Lead: [Xe], 4f14, 5d10, 6s2, 6p2
83 – Bismuth: [Xe], 4f14, 5d10, 6s2, 6p3	84 – Polonium: [Xe], 4f14, 5d10, 6s2, 6p4
85 – Astatine: [Xe], 4f14, 5d10, 6s2, 6p5	86 – Radon: [Xe], 4f14, 5d10, 6s2, 6p6
87 – Francium: [Rn], 5f1	88 – Radium: [Rn], 5f2
89 – Actinium: [Rn], 5f3	90 – Thorium: [Rn], 5f4
91 – Protactnium: [Rn], 5f5	92 – Uranium: [Rn], 5f6
93 – Neptunium: [Rn], 5f7	94 – Plutonium: [Rn], 5f8
95 – Americium: [Rn], 5f9	96 – Curium: [Rn], 5f10
97 – Berkelium: [Rn], 5f11	98 – Calfifornium: [Rn], 5f12
99 – Einsteinium: [Rn], 5f13	100 – Fermium: [Rn], 5f14
101 – Mendelevium: [Rn], 5f14, 6d1	102 – Nobelium: [Rn], 5f14, 6d2
103 – Lawrencium: [Rn], 5f14, 6d3	104 - Rutherfordium: [Rn], 5f14, 6d4
105 - Dubnium: [Rn], 5f14, 6d5	106 – Seaborgium: [Rn], 5f14, 6d6
107 – Bohrium: [Rn], 5f14, 6d7	108 – Hassium: [Rn], 5f14, 6d8
109 – Meitnerdium: [Rn], 5f14, 6d9	110 – Darmstadtium: [Rn], 5f14, 6d10
111 – Roentgenium: [Rn], 5f14, 6d10, 7s1	112 – Ununbium: [Rn], 5f14, 6d10, 7s2
113 – Ununtrium: [Rn], 5f14, 6d10, 7s2, 7p1	114 – Ununquadium: [Rn], 5f14, 6d10, 7s2, 7p2
115 – Ununpentium: [Rn], 5f14, 6d10, 7s2, 7p3	116 – Ununhexium: [Rn], 5f14, 6d10, 7s2, 7p4
117 – Ununseptium: [Rn], 5f14, 6d10, 7s2, 7p5	118 – Ununoctium: [Rn], 5f14, 6d10, 7s2, 7p6