Transcription of 2.6 Elements and the Periodic Table • Elements in a group ...
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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 2.7 Compounds • Combination of two or more elements in some definite proportion • Chemical bonds – the forces that hold the atoms of elements together in compounds – Ionic bonding – results from transfer of electrons from one atom to another
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