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Periodic table - Coggle Diagram
Periodic table
metals or non-metals
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If an element is conductive and its oxide is basic then the element is a metal
If an element is not conductive and its oxide is acidic then it’s a non metal
electron configuration
the electronic configuration of an element tells you how many electrons are in each shell around an electron’s nucleus
for example, sodium has 11 electrons: 2 in its most inner shell, then 8, then 1 in its outermost shell.
remember- electrons fill the shells closer to the nucleus before filling any further out. 1st shell holds 2 electrons, 2nd and 3rd hold 8
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arrangement
Elements are arranged in order of atomic (proton) number (bottom number) and so that elements with similar properties are in columns, known as groups.
Elements in the same periodic group have the same amount of electrons in their outer shell, which gives them similar chemical properties.
elements with the same number of shells of electrons are arranged in rows called periods
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group vs period
group number: gives number of electrons in outer shell e.g. group 3 has 3 electrons in outer shell
period number: gives number of electron shells e.g. period 1 has 1 shell of electrons
noble gases
They have 8 electrons in their outer shell (except helium, which has 2).
They are unreactive and do not easily form molecules, because they have a stable arrangement of electrons.