Molecular Chemistry 1
Abidaan Chohan
Molecular Structure and Bonding
- Molecular structure and bonding are fundamental concepts in chemistry that
govern the arrangement of atoms within a molecule and the forces holding them
together. Understanding these concepts is crucial for predicting chemical
behavior, reactivity, and physical properties of substances.
Atomic Structure Recap
1. Atoms: The basic units of matter,
composed of a nucleus
containing protons and neutrons,
orbited by electrons.
Fig no. 1: Atom’s Structure
2. Electron Configuration: The
arrangement of electrons in
atomic orbitals around the
nucleus, following principles like
the Aufbau principle, Pauli
exclusion principle, and Hund's
rule.
Fig no. 2: Aufbau principle
Aufbau principle:
The Aufbau principle states that
electrons fill the lowest energy orbitals
first before occupying higher energy
orbitals in an atom's electronic
configuration.
IN SIMLE TERMS:
- The Aufbau principle is like filling
a building from the bottom up,
where electrons go into the
lowest energy levels first before
moving to higher ones.
Fig no. 3: Pauli Exclusion Principle
Pauli exclusion principle
The Pauli Exclusion Principle
states that no two electrons in an atom
can have the same set of quantum
numbers, thus limiting the occupancy of
a single quantum state to a maximum of
two electrons with opposite spins.
IN SIMPLE TERMS:
- The Pauli Exclusion Principle
says that no two electrons in an
atom can be in the exact same
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Electron Configuration
