Question

electron configuration practice name: for the elements draw the orbital diagrams and write out the electron configuration: magnesium also write the electron configuration: calcium also write the electron configuration: phosphorus also write the electron configuration: copper also write the electron configuration: manganese also write the electron configuration: argon also write the electron configuration:

Explanation:

Step1: Recall electron - filling rules

Electrons fill orbitals in order of increasing energy (1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d etc.), with a maximum of 2 electrons per orbital and following Hund's rule (electrons fill degenerate orbitals singly first before pairing up).

Step2: Determine electron numbers for each element

• Magnesium (Mg) has 12 electrons. Its electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{2}$.
• Calcium (Ca) has 20 electrons. Its electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$.
• Phosphorus (P) has 15 electrons. Its electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$.
• Copper (Cu) has 29 electrons. Due to the stability of a full 3d sub - shell, its electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{1}$ instead of the expected $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{9}4s^{2}$.
• Manganese (Mn) has 25 electrons. Its electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^{2}$.
• Argon (Ar) has 18 electrons. Its electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$.

Answer:

Magnesium: $1s^{2}2s^{2}2p^{6}3s^{2}$
Calcium: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$
Phosphorus: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$
Copper: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{1}$
Manganese: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^{2}$
Argon: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$