2.6 Elements and the Periodic Table • Elements in a group ...

Elements and the Periodic Table Elements in a group have similar properties Periodicity in the properties of the Elements Elements in a period have different properties Mendeleev's Table , 1871 arrangement by Metals atomic mass good electrical and heat conductivity, malleable, Modern version of the Table arrangement by ductile atomic number Groups vertical columns in the Table Nonmetals A groups (1, 2, 13-18) representative Elements poor electrical and heat conductivity, neither malleable nor ductile, often gases or liquids B groups (3-12) transition Elements Inner transition Elements lanthanides & Metalloids actinides semiconductors, intermediate properties Periods horizontal rows in the Table Properties change gradually down in a group group 1A (1) - alkali metals (Li, Na, K, Rb.)

2.6 Elements and the Periodic Table • Periodicity in the properties of the elements – Mendeleev’s table, 1871 – arrangement by atomic mass – Modern version of the table – arrangement by atomic number • Groups – vertical columns in the table – A groups (1, 2, 13-18) – representative elements – B groups (3-12) – transition ...

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  Table, Elements, Periodic, 6 elements and the periodic table

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