Question
Write the electron configurations for each of the following elements and its $3+$ ions:(a) $\mathrm{La}$(b) $\mathrm{Sm}$(c) $\mathrm{Lu}$
Step 1
The atomic number is equal to the number of electrons in a neutral atom. For La, the atomic number is 57. For Sm, the atomic number is 62. For Lu, the atomic number is 71. Show more…
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