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Our periodic table. Just click on black marked elements and you will get basic information about them.

group  →	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
↓  periods	ia	iia	iiib	ivb	vb	vib	viib	---	viiib	---	ib	iib	iiia	iva	va	via	viia	viiia
1	1 H																	2 H
2	3 Li	4 Be											5 B	6 C	7 N	8 O	9 F	10 Ne
3	11 Na	12 Mg											13 Al	14 Si	15 P	16	17 Cl	18 Ar
4	19 K	20	21 Sc	22 Ti	23 V	24 Cr	25 Mn	26 Fe	27 Co	28 Ni	29 Cu	30 Zn	31 Ga	32 Ge	33 As	34 Se	35 Br	36 Kr
5	37 Rb	38 Sr	39 Y	40 Zr	41 Nb	42 Mo	43 Tc	44 Ru	45 Rh	46 Pd	47 Ag	48 Cd	49 In	50 Sn	51 Sb	52 Te	53 I	54 Xe
6	55 Cs	56 Ba	*	72 Hf	73 Ta	74 W	75 Re	76 Os	77 Ir	78 Pt	79 Au	80 Hg	81 Tl	82 Pb	83 Bi	84 Po	85 At	86 Rn
7	87 Fr	88 Ra	**	104 Rf	105 Db	106 Sg	107 Bh	108 Hs	109 Mt	110 Ds	111 Rg	112 Uub	113 Uut	114 Uuq	115 Uup	116 Uuh	117 Uus	118 Uuo
*Lanthanoids				57 La	58 Ce	59 Pr	60 Nd	61 Pm	62 Sm	63 Eu	64 Gd	65 Tb	66 Dy	67 Ho	68 Er	69 Tm	70 Yb	71 Lu
** Aktinoids				89 Ac	90 Th	91 Pa	92 U	93 Np	94 Pu	95 Am	96 Cm	97 Bk	98 Cf	99 Am	100 Fm	101 Md	102 No	103 Lr

Chemical groups in The Periodic table

Alkali Metals 2	Alkaline earth metals 2	Lanthanides 1, 2	Aktinides 1, 2	Transition Elements 2
Metals 2	Metalloids	Nonmetals	Halogens 3	Noble gases 3

¹ Actinides and Lanthanides are Inner transition elements.

² Alkali metals, Alkaline earth metals, Transition elements, Actinides, Lanthanides and metals are known as metals.

³ Halogens and noble gases are too nonmetals.

Borders show natural occurrence

elements with full border lines have isotopes older than earth (primordial)

elements with cut boarder lines arised naturally by elementary particle decay and they are not older than earth

elements with dot borders lines were create artificially (synthetic elements)

elements without border lines haven´t discover yet.

Dmitri Mendeleev, also spelt Dmitry Mendeleyev, middle name (patronymic) Ivanovich, a Siberian-born Russian chemist, was the first scientist to make a periodic table much like the one we use today. Mendeleev arranged the elements in a table ordered by atomic mass. It is sometimes said that he played "chemical solitaire" on long train rides using cards with various facts of known elements.[8] On March 6, 1869, a formal presentation was made to the Russian Chemical Society, entitled The Dependence Between the Properties of the Atomic Weights of the Elements.

Mendeleev predicted the discovery of other elements and left space for these new elements, namely eka-silicon (germanium), eka-aluminium (gallium), and eka-boron (scandium). Thus, there was no disturbance in the periodic table.

He pointed out that some of the then current atomic weights were incorrect.

He provided for variance from atomic weight order

Unknown to Mendeleev, Lothar Meyer was also working on a periodic table. In his work published in 1864, Meyer presented only 28 elements, classified not by atomic weight but by valence alone. Also, Meyer never came to the idea of predicting new elements and correcting atomic weights. Only a few months after Mendeleev published his periodic table of all known elements (and predicted several new elements to complete the table, plus some corrected atomic weights), Meyer published a virtually identical table. Some people consider Meyer and Mendeleev the cocreators of the periodic table, although most agree that Mendeleev´s accurate prediction of the qualities of the undiscovered elements lands him the larger share of credit. In any case, at the time Mendeleev´s predictions greatly impressed his contemporaries and were eventually found to be correct. An English chemist, William Odling, also drew up a table that is remarkably similar to that of Mendeleev in 1864.