Presentation on theme: "THE PERIODIC TABLE In the modern periodic table, you find the elements placed in vertical columns, called groups, and horizontal lines, called periods."— Presentation transcript:
1 THE PERIODIC TABLEIn the modern periodic table, you find the elements placed in vertical columns, called groups, and horizontal lines, called periods.
2 THE PERIODSThe elements are placed in horizontal lines, on crescent atomic number. Each line is called period. There are 7 periods. Each period starts with an element with only one electron in a new principal level of energy.
3 THE FIRST PERIODIt contains only 2 elements, H and He because at the most there are 2 electrons in the first level.HHe
4 Li Be B C N O F Ne THE SECOND PERIOD It contains 8 elements, from Li to Ne, because at the most there are 8 electrons in the second level.LiBeBCNOFNe
5 Na Mg Al Si P S Cl Ar THE THIRD PERIOD The third period should contain 18 elements, but the sublevel 3d follows the 4s in the energetic diagram, so in the third period we have only 8 elements corresponding to filling of sublevels 3s and 3p.NaMgAlSiPSClAr
6 THE FOURTH PERIOD K Br Kr The fourth period is composed by 18 elements from K to Kr. This period contains 10 elements, from Sc to Zn, corresponding to filling of sublevel 3d.KCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
7 THE FIFTH PERIODThe fifth period is composed by 18 elements from Rb to Xe. They complete the d sublevel.RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
8 THE SIXTH PERIOD Lu Tb Cs Pr Nd Eu Gd Dy Ho Er Yb The sixth period is composed by 18 elements from Cs to Rn. They fill the f sublevel. In this period there are other fourteen elements called “Lantanidi”. They have the same electronic configuration of La.CsBaLa*HfTaWReOsIrPtAuHgTlPbBiPoAtRn*CePrNdPmSmEuGdTbDyHoErTmYbLu
9 THE SEVENTH PERIOD The seventh period is composed by 3 elements from Fr to Ac. They complete the f sublevel. In this period there are other fourteen elements called “Attinidi”. They have the same electronic configuration of Ac. The elements from U to Lr are artificial and their names derive from the ones of their discoverers.FrRaAc**ThPaUNpPuAmCmBkCfEsFmMdNoLr