Which orbital in each of the following pairs is higher in energy? (a) 5p or 5d (b) 4s or 3p (c)

step 1 So here we're going to be comparing different orbitals to figure out which one is higher and ene

Which orbital in each of the following pairs is higher in...

Key Concepts

Penetration and Shielding Effects

Penetration refers to the ability of an orbital’s electron density to extend close to the nucleus, reducing the effects of shielding by other electrons. In contrast, orbitals that are less penetrating experience more shielding, which raises their energy. This interplay between penetration and shielding significantly influences the energy ordering of orbitals.

n+l Rule (Madelung Rule)

The n+l rule provides a guideline for the order in which orbitals are filled in many-electron atoms. According to this rule, an orbital with a lower sum of n+l typically lies at a lower energy level. If two orbitals have the same n+l value, the orbital with the lower principal quantum number (n) is usually lower in energy.

Atomic Orbitals and Energy Levels

Atomic orbitals are regions around the nucleus where electrons are likely to be found. Their energies depend on factors like the principal quantum number and electron-electron interactions, meaning that orbitals are not simply ordered by their labels but by a combination of these factors in many-electron atoms.

Principal and Angular Momentum Quantum Numbers

The principal quantum number (n) defines the main energy level and relative size of an orbital, while the angular momentum quantum number (l) denotes its shape and degree of penetration toward the nucleus. Generally, for electrons in the same shell, orbitals with lower l values penetrate closer to the nucleus and are lower in energy compared to those with higher l.

Transcript

Please give Ace some feedback