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M. Douglas Chapter 5

Atomic theory and structure

QuestionAnswer
Dalton's atomic model Elements are indivisible atoms; Same elements are alike in mass and size; different elements differ in mass and size;law of conservation of matter; law of definite proportion; law of multiple proportion
What is the law of definite composition? compounds always contain two or more elements combined in definite proportion by mass
What is the law of multiple proportion? Atoms of two or more elements may combine in different ratios to form different compounds.
What is a law? A summary of observed behavior.
What is a model of theory? A model is an attempt to explained the observed behavior.
What are three subatomic particles? Electrons, Neutrons and Protons.
Who was J.J. Thomson? A scientist from England that introduced the idea of subatomic particles. (1897)
What is the atomic number? It represents the number of protons in the nucleus of an atom.
What is the mass number? It represents the number of protons and neutrons.
What are isotopes? Elements having the same atomic number but different atomic mass (mass number).
How do you use isotopic notation? Mass number on the left superscript, atomic number on the left subscript of the elements symbol.
How do you identify isotopes of an element? By the symbol a hyphen then the number of mass number of the isotope. i.e. C-12; C-13; C-14
Created by: Vipdesigner
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