Bohr Model Quick Prez & Quizizz

Bohr Model Quick Prez & Quizizz

Energy Levels

Poll

How well do you think you know the concept of the Bohr Model?

• Got it down!

• Getting there!

• Not quite sure yet....

• No clue

Bohr Model

• Often referred to as the "planetary" model

• This is because it models the electrons as orbiting the nucleus like the planets orbit the sun.

• 
  

Bohr Model-INCORRECT

• We have since discovered that electrons do not behave like planets orbiting the sun

• 
  

• 
  

rather the electrons move exceedingly FAST within certain regions...

ELECTRON CLOUD MODEL

https://www.youtube.com/watch?v=P2IsIkSn5bk

Multiple Choice

The Bohr model is incorrect and the Electron Cloud model is correct.

• True

• False

BUT... Bohrs model is very helpful for showing the # of energy levels & ...

just look at the PERIODS (rows)!!!

Multiple Choice

What do you need to look at on the PT to determine how many electron SHELLS/LEVELS an atom has?

AND the possible # of electrons found in each level

2. 8. 18. 32. 32. 18. 2

aren't you glad you only have to know the first 4 levels & the OCTET RULE!!!!

Multiple Choice

How many electrons do the first four energy levels/shells HOLD?

• 2, 8, 8, 16

• 2, 8, 18, 18

• 2, 8, 18, 32

The OCTET (8) Rule-

Atoms tend to form compounds that give them EIGHT valence electrons and thus the electron configuration of a noble gas.

Multiple Choice

What is the OCTET rule in easy words mean?

• energy levels are happy when they have 8 electrons (except the first level, it only needs 2)

• energy levels are happy when they have 18 electrons (except the first level, it only needs 2)

• energy levels are sad when they have 8 electrons (except the first level, it only needs 2)

An exception to an octet 

of electrons is in the case of the first noble gas, helium, which only has two valence electrons.

The VALANCE electrons are the electrons in outer most shell/level/ring.

The VALANCE electrons are REALLY important because

they determine how reactive an element is...

You can determine how many VALENCE electrons atoms have by looking at the group #s of the main electrons

Multiple Choice

What do you need to look at on the PT to determine how many VALANCE ELECTRONS an atom has?

Poll

soooo....do you feel this was worth me spending 2.5 hrs on it? PLEASE be honest...don't just try to make me feel good. I will make more of these, IF you felt like you learned from it. :)

• YES

• not really.....

• NOT at all!

• it was a neat change but not worth that much time

TIME to put your new found knowledge to WORK!

Let's draw a few atoms showing the number of valence electrons they have and the number of energy levels. :)