Question
The electron configuration for arsenic, As, is $[\mathrm{Ar}] 3 d^{10} 4 s^{2} 4 p^{3} .$ How many valence electrons does an As atom have? Write the symbol for the ion it forms to achieve a noble-gas configuration.
Step 1
The valence electrons are the electrons in the outermost shell of an atom. In this case, the outermost shell is the 4th shell. Show more…
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