Multiple Choice
Which group of elements on the periodic table is considered unreactive?
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2. Atoms & Elements
Periodic Table: Group Names
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Which pair of elements has the most similar chemical properties?
A
C and N
B
Mg and Al
C
O and Cl
D
Na and K
Verified step by step guidance1
Understand that elements with the most similar chemical properties are typically found in the same group (vertical column) of the periodic table because they have the same number of valence electrons.
Identify the groups of each pair of elements: C (Group 14), N (Group 15); Mg (Group 2), Al (Group 13); O (Group 16), Cl (Group 17); Na (Group 1), K (Group 1).
Recognize that elements in the same group share similar valence electron configurations, which leads to similar chemical behavior.
Compare the pairs: C and N are in different groups, Mg and Al are in different groups, O and Cl are in different groups, but Na and K are both in Group 1 (alkali metals).
Conclude that Na and K have the most similar chemical properties because they belong to the same group and have the same number of valence electrons.
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