Question

c. the sum of the superscripts should equal the total number of electrons. example: 12mg 1s² 2s² 2p⁶ 3s²
i. configuration writing practice
a. write a ground state electron configuration for each neutral atom. ground state means that all of the lowest possible energy levels (up to the proper number of electrons for the element) are filled.

1. na:
2. pb:
3. sr:
4. u:
5. n:
6. ag:
7. ti:
8. ce:
9. cl:
10. hg:

Explanation:

Step1: Recall electron - filling rules

Use the Aufbau principle, Pauli - exclusion principle, and Hund's rule to fill electrons into orbitals.

Step2: Determine atomic number of Na

Sodium (Na) has an atomic number of 11. Fill electrons as follows: $1s^22s^22p^63s^1$.

Step3: Determine atomic number of Pb

Lead (Pb) has an atomic number of 82. Its electron configuration is $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}6p^2$.

Step4: Determine atomic number of Sr

Strontium (Sr) has an atomic number of 38. Its electron configuration is $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^2$.

Step5: Determine atomic number of U

Uranium (U) has an atomic number of 92. Its electron configuration is $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}6p^67s^25f^36d^1$.

Step6: Determine atomic number of N

Nitrogen (N) has an atomic number of 7. Its electron configuration is $1s^22s^22p^3$.

Step7: Determine atomic number of Ag

Silver (Ag) has an atomic number of 47. Its electron configuration is $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^14d^{10}$.

Step8: Determine atomic number of Ti

Titanium (Ti) has an atomic number of 22. Its electron configuration is $1s^22s^22p^63s^23p^64s^23d^2$.

Step9: Determine atomic number of Cl

Chlorine (Cl) has an atomic number of 17. Its electron configuration is $1s^22s^22p^63s^23p^5$.

Step10: Determine atomic number of Hg

Mercury (Hg) has an atomic number of 80. Its electron configuration is $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}$.

Answer:

1. $1s^22s^22p^63s^1$
2. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}6p^2$
3. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^2$
4. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}6p^67s^25f^36d^1$
5. $1s^22s^22p^3$
6. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^14d^{10}$
7. $1s^22s^22p^63s^23p^64s^23d^2$
8. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}6p^67s^25f^16d^1$
9. $1s^22s^22p^63s^23p^5$
10. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}$