10.10 - • Isotopes o Different masses in but same element...

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Cathode ray tubes Emit rays of high energy electrions Evidence for subatomic particles Radioactivity o The different radioactive charged particles Neutral - gamma Postitive - alpha Negative - beta Elements o Element is definded by the number of protons in nucleus o Examples Any atom with 6 protons is a carbon atom Any atom ith 3 is lithum Number of neutrons and elections is irrelevant o This specific number is called the atomic number o Periodic table organized by atomic number
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Unformatted text preview: • Isotopes o Different masses in but same element o Isotopes are often referred to by their masses (protons + nuetrions For example U-235 or U238 Or super scripted Us This number is called the mass number • Atomic masses o These are listed on most periodic tables o Why is the mass greater than the atomic number Number is protons o Why is the number not a who umnber o A weighted average of all the isotopes give the atomic mass...
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