which two elements have similar properties and 8 electrons in their outermost shells? a. arsenic and antimony b. iodine and bromine c. sodium and potassium d. krypton and xenon

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# Brief Explanations:
- **Option A**: Arsenic ($As$) has $5$ electrons in its outermost shell ($ns^{2}np^{3}$, $n = 4$ for $As$), and antimony ($Sb$) has $5$ electrons in its outermost shell ($ns^{2}np^{3}$, $n=5$ for $Sb$).
- **Option B**: Iodine ($I$) has $7$ electrons in its outermost shell ($ns^{2}np^{5}$, $n = 5$ for $I$), and bromine ($Br$) has $7$ electrons in its outermost shell ($ns^{2}np^{5}$, $n = 4$ for $Br$).
- **Option C**: Sodium ($Na$) has $1$ electron in its outermost shell ($ns^{1}$, $n = 3$ for $Na$), and potassium ($K$) has $1$ electron in its outermost shell ($ns^{1}$, $n=4$ for $K$).
- **Option D**: Krypton ($Kr$) and xenon ($Xe$) are noble gases. Noble gases (except helium) have $8$ electrons in their outermost shells ($ns^{2}np^{6}$). Elements in the same group (noble - gas group) have similar chemical properties.

# Answer:
D. Krypton and xenon

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