Answer:
Al₁₃= 1s² 2s² 2p⁶ 3s² 3p¹
Na₁₁ = 1s² 2s² 2p⁶ 3s¹
Mg₁₂= 1s² 2s² 2p⁶ 3s²
Step-by-step explanation:
Sodium is present in group one.
Atomic number of sodium is 11.
Its atomic mass is 23 amu.
Electronic configuration:
Na₁₁ = 1s² 2s² 2p⁶ 3s¹
Magnesium is present in group two.
Its atomic number is 12.
Its atomic mass is 24 amu.
Electronic configuration:
Mg₁₂= 1s² 2s² 2p⁶ 3s²
Aluminium is present in group 3.
its atomic number is 13.
its atomic mass is 27 amu.
Electronic configuration:
Al₁₃= 1s² 2s² 2p⁶ 3s² 3p¹