Bohr's Atomic Model

Hi, everyone,

As we have discussed in class, Bohr came up with his model of the atom through experimentation.

Through his experiments, he found that atoms only absorb certain wavelengths of light (i.e. certain energy). This gives evidence that electrons can only occupy certain energy levels (which we now call shells). The energy carried by light of these wavelengths corresponds to the energy gap between the shells.

Should there not be shells (discrete energy levels), any wavelength of light would be absorbed by the atom to excite its electron to any energy state.

Here's a video which I think is rather useful. It talks about the emission spectrum, which shows that light emitted by excited atoms (i.e. atoms with their electrons promoted to higher energy shells) are also of particular wavelength and expectedly, this energy corresponds to the gap between the shells.

Enjoy!



For the learners who prefer reading, this website is also quite simple to understand.

Test for Weeks 9 and 10

Hi, everyone,

This is an announcement about the tests coming up:

1. Week 9:

SPA Skill A (Written test)
Date: 29 Feb
Time: Immediately after school
Venue: Auditorium

2. Week 10:

Atomic Structure (Open-book assessment)
Date: Lesson 1
Venue: Respective classrooms

Mug hard! Remember, all to get 4.0!!

The Mystery Begins

Yoz, ppl,

About two months have passed since we embarked on the journey of conquering the subject of Chemistry together.

To some, the subject seems Cheem... (for our international scholars, 'Cheem' = profound").

To others, it is just a mystery that you would like to solve.

Whatever the case, I hope this blog would serve as a point for you to discover more about the topic.

Let's dive into our Cheem Mystery!


Picture taken from HawaiiArt.com

p.s. anything wrong with the picture?