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Chapters 11 12 Periodic Table Name __________________ ( ) Class __________ Date _________ History of the Periodic Table Russian chemist Dmitri Ivanovich Mendeleev 1834-1907 Arranged elements in order of increasing atomic masses Elements with similar chemical properties fall into the same vertical column Such an arrangement is the Periodic Table The Periodic Table The Periodic Table is a list of elements arranged in order of ______________ _____________ (__________) ____________. Groups The periodic table is divided into eight vertical columns known as Groups. The Groups are numbered I, II, III etc from left to right. Periods The periodic table is divided into seven horizontal rows known as periods. Each period is numbered 1, 2, 3 etc. Transition metals The Periodic Table also has three other blocks of elements, known as the transition elements, the lanthanides and the actinides. The Periodic Trends Metal and Non-metals Bold line divides metals from the non-metals Metals are grouped on the ______________ side of the periodic table. Non-metals are grouped on the _____________ side of the periodic table. Elements located close to the bold line (such as Si and Ge) have properties of a metal and non-metal. They are called _______________ and are used extensively in the semiconductor industry. From left to right across a period, there is a _____________ in ___________ properties and an _______________ in _______________ properties. Across a period, there is also a change in the chemical properties of oxides of the elements. SHAPE MERGEFORMAT Elements in the Period All elements in the same period has the same number of ________________. Elements in period 2 have 2 shells, while elements in period 3 will have 3 shells. The number of outer electrons of elements in the same period _____________ progressively by one across the period from left to right. Elements in a Group The number of outer electrons is the same as the __________________. Elements with