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Chem (Periodic table (Example: Rubidium (is in the first group: alkali…
Chem
columns are groups or family: elements are most similar when in the same group: group can say a lot about valence electrons
Periods are rows: Pattern repeats after each period which is why elements are similar in each group. Elements are similar if closer in period
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group number shows the number of valence electrons. Because all elements want 8 valence electrons you can tell from the group.
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Roman Numerals are present when using transition metals as they can give different numbers of valence electrons
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