Unit 1 – Atomic Structure Yeung 1

Recall, the quantum model

is about electrons

behaving both a

___________ and a

_____________.

Electrons are in areas of

_______________

________________, these

are your orbitals.

What are atomic orbitals?

Quantum model Notes2

Unit 1 – Atomic Structure Yeung 2

Electron’s address To locate the exact “address” of the electrons, there

are 3 quantum numbers or clues to use:

1.

2.

3.

These 3 quantum numbers give you the size, shape and orientation of the

electrons

Unit 1 – Atomic Structure Yeung 3

Recap:

Magnetic Quantum Number

Principal Quantum Number Angular Quantum Number

Unit 1 – Atomic Structure Yeung 4

Relate the number of orbitals with the number of electrons: Since each orbital can have a maximum of 2 electrons, let’s see how this relates to the Periodic table.

Examples: How many total orbitals are there in energy level 2?

How many total electrons in energy level 2?

Unit 1 – Atomic Structure Yeung 5

How many total orbitals are there in energy level 3?

How many total electrons in energy level 3? What is the big picture? The “address” of the ____________ level, the ___________ of orbital, the ____________ of

electrons of an element can be found.

This is called the ____________________________________

Unit 1 – Atomic Structure Yeung 6

Unit 1 – Atomic Structure Yeung 7

For higher elements such as ones in the d sub-level and f sub-level, you must follow

the correct energy sequence as the energy levels do not always go in order.

Unit 1 – Atomic Structure Yeung 8

Recap:

Electrons function as waves and particles

Electrons are found in regions of space calculated from Schrodinger’s Wave equation

3 Principle Quantum numbers that determine where the electrons are located: n, l and m

Quantum numbers provide different sizes, shapes and spins

Electron configuration locates the electrons in terms of energy level and shape

Electron configurations are based on 3 principles, Aufbau, Pauli’s exclusion rule, and Hund’s rule