
Interpretation: Orbital that is first filled in an atom is to be determined.
Concept introduction: 3-D space around nucleus in which probability of finding an electron of particular energy is maximum, is called orbital. Quantum numbers are group of 4 numbers which tell everything about electron present in an atom. Principal quantum numbers indicates principal energy level in which electron in present. It is denoted by

Answer to Problem 34A
In an atom, electrons are filled in lower energy orbitals that are closer to nucleus before they are filled in higher energy ones.
Explanation of Solution
As per Aufbau’s rule electrons are filled in lower energy orbitals that are closer to nucleus before they are filled in higher energy ones. The order of orbital arranged in their increasing energies is as follows:
Higher orbital are indicated by higher
Also while filling of electrons, in a principal energy level
In an atom, electrons are filled in lower energy orbitals that are closer to nucleus before they are filled in higher energy ones.
Chapter 11 Solutions
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