Question

k
shorthand: $1s^22s^22p^63s^23p^64s^1$
si
shorthand:
mn
shorthand:
zr
shorthand:
(top right header: ionic cats & valence electrons)

Explanation:

Step1: Find noble gas for Sn

Tin (Sn, atomic number 50) has the preceding noble gas Krypton (Kr, atomic number 36).

Step2: Write shorthand for Sn

Fill remaining 14 electrons: $[\text{Kr}] 4d^{10} 5s^2 5p^2$

Step3: Find noble gas for Mn

Manganese (Mn, atomic number 25) has the preceding noble gas Argon (Ar, atomic number 18).

Step4: Write shorthand for Mn

Fill remaining 7 electrons: $[\text{Ar}] 3d^5 4s^2$

Step5: Find noble gas for Zr

Zirconium (Zr, atomic number 40) has the preceding noble gas Krypton (Kr, atomic number 36).

Step6: Write shorthand for Zr

Fill remaining 4 electrons: $[\text{Kr}] 4d^2 5s^2$

Answer:

• Sn Shorthand: $[\text{Kr}] 4d^{10} 5s^2 5p^2$
• Mn Shorthand: $[\text{Ar}] 3d^5 4s^2$
• Zr Shorthand: $[\text{Kr}] 4d^2 5s^2$