Atomic theory and structure
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| 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
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| What is the law of definite composition? | compounds always contain two or more elements combined in definite proportion by mass
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| What is the law of multiple proportion? | Atoms of two or more elements may combine in different ratios to form different compounds.
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| What is a law? | A summary of observed behavior.
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| What is a model of theory? | A model is an attempt to explained the observed behavior.
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| What are three subatomic particles? | Electrons, Neutrons and Protons.
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| Who was J.J. Thomson? | A scientist from England that introduced the idea of subatomic particles. (1897)
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| What is the atomic number? | It represents the number of protons in the nucleus of an atom.
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| What is the mass number? | It represents the number of protons and neutrons.
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| What are isotopes? | Elements having the same atomic number but different atomic mass (mass number).
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| How do you use isotopic notation? | Mass number on the left superscript, atomic number on the left subscript of the elements symbol.
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| 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
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