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Chapter 6

The Periodic Table

What is periodic law? when elements are arranged in order of increasing atomic #
What is there periodic repetition of ? physical and chemical properties
What are the three most broad classification of all the element? metals, metalloids and non-metals
What are some properties of metals? 80% of elements, almost all are solids, good conductors of heat and electricity, luster, malleable and ductile
What are some properties of non-metals? most are gases, the solids are brittle, poor conductors of heat and electricity
What are some properties of metalloids? generally similar to metals and non-metals, properties can range between metallic and nonmetallic depending on the conditions
Who arranged the elements in order of increasing mass in a way that demonstrated a set of repeating properties? Mendeleev
Who both created a table of elements? Demitri Mendeelev and Lother Meyer, Mendeleev was given more credit because he published this earlier that year and better explained usefulness
Who identified five new elements? Dalton and Lavoisier
By 1700 how many elements were identified? 13 including gold, copper and silver
What does each period correspond to? an energy level
Why are there more elements in higher # periods? there are more orbitals
Created by: dwigmans13



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