Question

electron configurations worksheet
write the complete ground - state electron configurations for the following:

1. sodium
2. oxygen
3. calcium
4. titanium
5. rubidium
6. lead
7. arsenic

write the abbreviated ground - state electron configurations for the following:

1. helium
2. nitrogen
3. chlorine
4. iron
5. zinc
6. barium
7. promethium

Explanation:

Step1: Recall electron - filling rules

Use the Aufbau principle, Pauli - exclusion principle, and Hund's rule to write electron configurations.

Step2: Determine atomic numbers

Find the atomic numbers of the elements from the periodic table, which equal the number of electrons in the neutral atom.

Step3: Write complete configurations

For example, for oxygen (atomic number = 8), the complete ground - state electron configuration is $1s^{2}2s^{2}2p^{4}$.

Step4: Write abbreviated configurations

Use the noble - gas core notation. For nitrogen (atomic number = 7), the abbreviated ground - state electron configuration is $[He]2s^{2}2p^{3}$.

Answer:

1. Hydrogen ($H$): $1s^{1}$
2. Oxygen ($O$): $1s^{2}2s^{2}2p^{4}$
3. Calcium ($Ca$): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$
4. Titanium ($Ti$): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}$
5. Rubidium ($Rb$): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{1}$
6. Lead ($Pb$): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{10}6p^{2}$
7. Arsenic ($As$): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{3}$
8. Helium ($He$): $[He]$
9. Nitrogen ($N$): $[He]2s^{2}2p^{3}$
10. Chlorine ($Cl$): $[Ne]3s^{2}3p^{5}$
11. Iron ($Fe$): $[Ar]4s^{2}3d^{6}$
12. Zinc ($Zn$): $[Ar]4s^{2}3d^{10}$
13. Barium ($Ba$): $[Xe]6s^{2}$
14. Promethium ($Pm$): $[Xe]6s^{2}4f^{5}$