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Which pair of elements is most likely to have the most similar chemical properties?
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2. Atoms & Elements
Periodic Table: Group Names
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Which region of the periodic table contains the most reactive metals?
A
Group 1 (alkali metals) on the far left
B
Group 2 (alkaline earth metals) next to the alkali metals
C
Transition metals in the center
D
Group 18 (noble gases) on the far right
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Understand that the reactivity of metals generally depends on how easily they lose electrons to form positive ions.
Recall that Group 1 elements, known as alkali metals, have a single electron in their outermost shell, which they lose very easily, making them highly reactive.
Compare this with Group 2 elements (alkaline earth metals), which have two outer electrons and are less reactive than Group 1 because it takes more energy to remove two electrons.
Note that transition metals in the center of the periodic table have more complex electron configurations and generally show moderate reactivity.
Recognize that Group 18 elements (noble gases) are nonmetals and are very unreactive due to their full outer electron shells.
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