Final answer:
The electron configuration for Si in noble-gas notation is [Ne] 3s² 3p⁴. The electron configuration for Y in noble-gas notation is [Kr] 5s² 4d².
Step-by-step explanation:
The electron configuration for Si in noble-gas notation is [Ne] 3s² 3p⁴. This means that Si has 14 electrons in total, with the first 10 electrons being represented by the noble gas neon (Ne) configuration [Ne] and the remaining 4 electrons occupying the 3s and 3p orbitals.
The electron configuration for Y in noble-gas notation is [Kr] 5s² 4d². This means that Y has 39 electrons in total, with the first 36 electrons being represented by the noble gas krypton (Kr) configuration [Kr] and the remaining 3 electrons occupying the 5s and 4d orbitals.