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Electronic formulas of atoms of chemical elements
(the layers are arranged in order of filling the sublevels)

To characterize the state of an electron, quantum numbers are used that determine the electron states and the types of atomic orbitals on which they are located. These quantum numbers are the main (n), orbital (l), magnetic (ml), and spin (ms). When composing an electronic formula, the most important are the principal and orbital quantum numbers. The main quantum number determines the energy level of the electron. It corresponds to the period number in the periodic system of DI. Mendeleev and takes integral values: 1,2,3 .... The orbital quantum number determines the shape of the orbitals. It can take integer values: 0,1,2 ... (n-1), which corresponds to the sublevels: s-, p-, d-, f ... The filling sequence of the electron orbitals is determined by the Klechkovsky rule "Electron Filling of Orbitals in an Atom occurs in the order of increasing sum of the principal and orbital quantum numbers n + 1. For the same sum, an orbital with a smaller value of n "is filled earlier. On the basis of this rule, electronic formulas of all chemical elements of the periodic system are compiled. The order of filling the orbitals is as follows

I period
№	chemical sign	Name element	The electronic formula
1	H	hydrogen	1s 1
2	He	helium	1s 2
II period
3	Li	lithium	1s 22s 1
4	Be	beryllium	1s 22s 2
5	B	boron	1s 22s 22p 1
6	C	carbon	1s 22s 22p 2
7	N	nitrogen	1s 22s 22p 3
8	O	oxygen	1s 22s 22p 4
9	F	fluorine	1s 22s 22p 5
10	Ne	neon	1s 22s 22p 6
III period
11	Na	natrium	1s 22s 22p 63s 1
12	Mg	magnesium	1s 22s 22p 63s 2
13	Al	aluminium	1s 22s 22p 63s 23p1
14	Si	silicon	1s 22s 22p 63s 23p2
15	P	phosphorus	1s 22s 22p 63s 23p3
16	S	sulfur	1s 22s 22p 63s 23p4
17	Cl	chlorine	1s 22s 22p 63s 23p5
18	Ar	argon	1s 22s 22p 63s 23p6
IV period
19	K	potassium	1s 22s 22p 63s 23p64s 1
20	Ca	calcium	1s 22s 22p 63s 23p64s 2
21	Sc	scandium	1s 22s 22p 63s 23p64s 23d1
22	Ti	titanium	1s 22s 22p 63s 23p64s 23d2
23	V	vanadium	1s 22s 22p 63s 23p64s 23d3
24	Cr	chromum	1s 22s 22p 63s 23p64s 13d5
25	Mn	manganese	1s 22s 22p 63s 23p64s 23d5
26	Fe	iron	1s 22s 22p 63s 23p64s 23d6
27	Co	cobalt	1s 22s 22p 63s 23p64s 23d7
28	Ni	nickel	1s 22s 22p 63s 23p64s 23d8
29	Cu	copper	1s 22s 22p 63s 23p64s 13d10
30	Zn	zink	1s 22s 22p 63s 23p64s 23d10
31	Ga	gallium	1s 22s 22p 63s 23p64s 23d104p1
32	Ge	germanium	1s 22s 22p 63s 23p64s 23d104p2
33	As	arsenic	1s 22s 22p 63s 23p64s 23d104p3
34	Se	selenium	1s 22s 22p 63s 23p64s 23d104p4
35	Br	bromine	1s 22s 22p 63s 23p64s 23d104p5
36	Kr	krypton	1s 22s 22p 63s 23p64s 23d104p6
V period
37	Rb	rubidium	1s 22s 22p 63s 23p64s 23d104p65s1
38	Sr	strontium	1s 22s 22p 63s 23p64s 23d104p65s2
39	Y	ittrium	1s 22s 22p 63s 23p64s 23d104p65s24d1
40	Zr	zirconium	1s 22s 22p 63s 23p64s 23d104p65s24d2
41	Nb	niobium	1s 22s 22p 63s 23p64s 23d104p65s14d4
42	Mo	molybdenium	1s 22s 22p 63s 23p64s 23d104p65s14d5
43	Tc	technetium	1s 22s 22p 63s 23p64s 23d104p65s24d5
44	Ru	ruthenium	1s 22s 22p 63s 23p64s 23d104p65s14d7
45	Rh	rhodium	1s 22s 22p 63s 23p64s 23d104p65s14d8
46	Pd	palladium	1s 22s 22p 63s 23p64s 23d104p65s04d10
47	Ag	silver	1s 22s 22p 63s 23p64s 23d104p65s14d10
48	Cd	cadmium	1s 22s 22p 63s 23p64s 23d104p65s24d10
49	In	indium	1s 22s 22p 63s 23p64s 23d104p65s24d105p1
50	Sn	tin	1s 22s 22p 63s 23p64s 23d104p65s24d105p2
51	Sb	antimony	1s 22s 22p 63s 23p64s 23d104p65s224d105p3
52	Te	tellurium	1s 22s 22p 63s 23p64s 23d104p65s24d105p4
53	I	iodine	1s 22s 22p 63s 23p64s 23d104p65s24d105p5
54	Xe	xenon	1s 22s 22p 63s 23p64s 23d104p65s24d105p6
VI period
55	Cs	cesium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s1
56	Ba	barium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s2
57	La	lanthanum	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s25d1
58	Ce	cerium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f2
59	Pr	praseodymium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f3
60	Nd	Neodymium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f4
61	Pm	promethium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f5
62	Sm	samarium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f6
63	Eu	europium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f7
64	Gd	gadolinium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f75d1
65	Tb	terbium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f9
66	Dy	dysprosium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f10
67	Ho	holmium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f11
68	Er	erbium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f12
68	Tm	thulium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f13
70	Yb	ytterbium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f14
71	Lu	lutetium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d1
72	Hf	hafnium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d2
73	Ta	tantalum	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d3
74	W	wolfram	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d4
75	Re	rhenium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d5
76	Os	Osmium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d6
77	Ir	Iridium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d7
78	Pt	Platinum	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s14f145d9
79	Au	aurum	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s14f145d10
80	Hg	Hydrargyrum	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d10
81	Tl	Thallium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p1
82	Pb	plumbum	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p2
83	Bi	Bismuthum	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p3
84	Po	Polonium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p4
85	At	Astatium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p5
86	Rn	radon	1s 22s 22p 63s 23p64s 23d104p65s14d105p66s24f145d106p6
VII period
87	Fr	Francium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s1
88	Ra	radium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s2
89	Ac	actinium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s26d1
90	Th	thorium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s26d25f0
91	Pa	protactinium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f26d1
92	U	uranium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f36d1
93	Np	neptunium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f46d1
94	Pu	plutonium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f56d1
95	Am	americium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f7
96	Cm	curium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f76d1
97	Bk	berkelium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f86d1
98	Cf	californium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f10
99	Es	einsteinium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f11
100	Fm	fermium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f12
101	Md	mendelevium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f13
102	No	nobelium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f14
103	Lr	lawrencium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d1
104	Rf	rutherfordium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d2
105	Db	dubnium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d3
106	Sg	seaborgium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d4
107	Bh	bohrium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d5
108	Hs	hassium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d6
109	Mt	meitnerium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d7
110	Ds	darmstadtium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d8
111	Rg	roentgenium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d9
112	Cn	copernicium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d10
113	Nh	nihonium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d107p1
114	Fl	flerovium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d107p2
115	Mс	moscovium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d107p3
116	Lv	livermorium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d107p4
117	Ts	tennessium	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d107p5
118	Og	oganesson	1s 22s 22p 63s 23p64s 23d104p65s24d105p66s24f145d106p67s25f146d107p6
s-elements	p-elements	d-elements	f-elements