Helium electron configuration

He (Helium) is an element with position number 2 in the periodic table. Located in the I period. Melting point: -272.2 ℃. Density: 0.00017 g/cm³.

Electronic configuration of the Helium atom:
1s²

Below is the electronic diagram of the Helium atom Distribution of electrons over energy levels in the He atom
1-st level (K): 2

The number of valence electrons in a Helium atom - 2.
Below are their quantum numbers (N - energy, L - angular momentum, M - magnetic moment, S - spin )

[1] H (Hydrogen) [2] He (Helium) [3] Li (Lithium) [4] Be (Beryllium) [5] B (Boron) [6] C (Carbon) [7] N (Nitrogen) [8] O (Oxygen) [9] F (Fluorine) [10] Ne (Neon) [11] Na (Sodium) [12] Mg (Magnesium) [13] Al (Aluminum) [14] Si (Silicon) [15] P (Phosphorus) [16] S (Sulfur) [17] Cl (Chlorine) [18] Ar (Argon) [19] K (Potassium) [20] Ca (Calcium) [21] Sc (Scandium) [22] Ti (Titanium) [23] V (Vanadium) [24] Cr (Chromium) [25] Mn (Manganese) [26] Fe (Iron) [27] Co (Cobalt) [28] Ni (Nickel) [29] Cu (Copper) [30] Zn (Zinc) [31] Ga (Gallium) [32] Ge (Germanium) [33] As (Arsenic) [34] Se (Selenium) [35] Br (Bromine) [36] Kr (Krypton) [37] Rb (Rubidium) [38] Sr (Strontium) [39] Y (Yttrium) [40] Zr (Zirconium) [41] Nb (Niobium) [42] Mo (Molybdenum) [43] Tc (Technetium) [44] Ru (Ruthenium) [45] Rh (Rhodium) [46] Pd (Palladium) [47] Ag (Silver) [48] Cd (Cadmium) [49] In (Indium) [50] Sn (Tin) [51] Sb (Antimony) [52] Te (Tellurium) [53] I (Iodine) [54] Xe (Xenon) [55] Cs (Cesium) [56] Ba (Barium) [57] La (Lanthanum) [58] Ce (Cerium) [59] Pr (Praseodymium) [60] Nd (Neodymium) [61] Pm (Promethium) [62] Sm (Samarium) [63] Eu (Europium) [64] Gd (Gadolinium) [65] Tb (Terbium) [66] Dy (Dysprosium) [67] Ho (Holmium) [68] Er (Erbium) [69] Tm (Thulium) [70] Yb (Ytterbium) [71] Lu (Lutetium) [72] Hf (Hafnium) [73] Ta (Tantalum) [74] W (Tungsten) [75] Re (Rhenium) [76] Os (Osmium) [77] Ir (Iridium) [78] Pt (Platinum) [79] Au (Gold) [80] Hg (Mercury) [81] Tl (Thallium) [82] Pb (Lead) [83] Bi (Bismuth) [84] Po (Polonium) [85] At (Astatine) [86] Rn (Radon) [87] Fr (Francium) [88] Ra (Radium) [89] Ac (Actinium) [90] Th (Thorium) [91] Pa (Protactinium) [92] U (Uranium) [93] Np (Neptunium) [94] Pu (Plutonium) [95] Am (Americium) [96] Cm (Curium) [97] Bk (Berkelium) [98] Cf (Californium) [99] Es (Einsteinium) [100] Fm (Fermium) [101] Md (Mendelevium) [102] No (Nobelium) [103] Lr (Lawrencium) [104] Rf (Rutherfordium) [105] Db (Dubnium) [106] Sg (Seaborgium) [107] Bh (Bohrium) [108] Hs (Hassium) [109] Mt (Meitnerium) [110] Ds (Darmstadtium) [111] Rg (Roentgenium) [112] Cn (Copernicium ) [113] Nh (Nichonium) [114] Fl (Flerovium) [115] Mc (Muscovy) [116] Lv (Livermore) [117] Ts (Tennessee) [118] Og (Oganesson)