Answer:
Step-by-step explanation:
The penetration of an electron into the region occupied by core electrons is determined by the electron configuration and the energy of the orbital.
Electrons in 3s orbitals are lower in energy than electrons in 3p orbitals and are therefore closer to the nucleus. As a result, electrons in 3s orbitals penetrate more deeply into the region occupied by core electrons. This means that electrons in 3s orbitals are more strongly attracted to the positively charged nucleus, and have a higher probability of being found closer to the nucleus compared to electrons in 3p orbitals.
In contrast, electrons in 3p orbitals are higher in energy and have a more diffuse distribution, meaning they are less likely to penetrate into the region occupied by core electrons and are more likely to be found farther away from the nucleus.
In conclusion, electrons in a 3s orbital penetrate more deeply into the region occupied by core electrons than electrons in a 3p orbital.