Electronic Configuration

Cations are

postiive ions

Anions are

negative ions

the arrangement of electrons in an atom is called the atoms

electron configuration

These rules define how electrons can be arranged in an atoms orbitals

The Aufbau principle

The Pauli Exclusion principle

Hund’s Rule

This states that each electron occupies the lowest energy orbital available

Aufbau Principle

Electrons in orbitals can be represented by

arrows in boxes

this represents an unoccupied orbital

An Empty Box

Thsi states that A max of 2 electrons can occupy a single atomic orbital, but only if the electrons have opposite spins

Pauli Exclusion Principle

This rule states that single electrons w the same spin must occupy each equal energy orbital before additional electrons w opposite spins can occupy the same orbitals

Hunds rule

You can represent an atoms electron config using one of 2 methods

orbital diagrams

electron config notation

electrons in orvitals can be represented by arrows in boxes

Orbital Diagrams

For this method, instead of boxes, it includes a superscript representing the number of electrons in the orbital

Electron Configuration Notation

is a method of representing electron configurations by using the noble gases

noble gas notations

The noble gas notation uses

bracketed symbols

are defined as electrons in the atoms outermost orbitals, these orbitals are associated w the atoms highest principal energy level

Valence electrons

The Electron dot structures are also known as

Lewis Structure

this consists of the element symbol surrounded by dots representing all of the atoms valence electrons

Electron dot structures or lewis structure