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Protons and Neutrons are found in the Nucleus and the Electrons orbit around the Nucleus in shells, as shown here
Isotopes are elements that differ in the number of Neutrons only!
Relative Abundance
They are arranged in order of there atomic number. Group number - Represents number of electrons in the outer shell.
Electronic Configuration First 20 Elements
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1 comment
about 11 years ago
I like these notes, which are clear and helpful.
There is one small mistake ... the notes contain a common spelling error: "They are arranged in order of THERE atomic number"; it should be 'their'.
But the notes deserve the Favourite I've given them!
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