Multiple Choice
Argon (Ar) belongs to which group of the periodic table?
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4. Atoms and Elements
Periodic Table: Group Names
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Which periodic table group is generally the most reactive (especially among metals) under standard conditions?
A
Group 17 (halogens)
B
Group 2 (alkaline earth metals)
C
Group 18 (noble gases)
D
Group 1 (alkali metals)
Verified step by step guidance1
Understand that the periodic table is organized into groups (columns) where elements share similar chemical properties.
Recall that reactivity in metals generally increases as you move down Group 1 (alkali metals) because their outermost electron is more easily lost, making them highly reactive.
Note that Group 17 (halogens) are highly reactive nonmetals, not metals, so they are not the most reactive metals.
Recognize that Group 2 (alkaline earth metals) are reactive but less so than Group 1 because they have two valence electrons, which are harder to lose than one.
Remember that Group 18 (noble gases) are very unreactive due to their full valence electron shells, so they are not reactive metals.
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