Multiple Choice
Which element has chemical properties most similar to those of fluorine?
2. Atoms & Elements
Periodic Table: Group Names
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Which pair of elements would likely have similar valency and thus similar chemical behavior?
A
C and Ne
B
Na and K
C
O and Cl
D
Mg and Al
Verified step by step guidance1
Understand that elements with similar valency have the same number of electrons in their outermost shell, which leads to similar chemical behavior.
Recall that elements in the same group (vertical column) of the periodic table have the same valency because they have the same number of valence electrons.
Identify the groups of the given pairs: C (group 14) and Ne (group 18), Na (group 1) and K (group 1), O (group 16) and Cl (group 17), Mg (group 2) and Al (group 13).
Compare the valence electrons of each pair: C has 4 valence electrons, Ne has 8; Na and K both have 1 valence electron; O has 6 valence electrons, Cl has 7; Mg has 2 valence electrons, Al has 3.
Conclude that Na and K, both being in group 1 with 1 valence electron, are the pair most likely to have similar valency and chemical behavior.
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