Bohr And Lewis Diagram /ionic Compounds/multivalent Elements Flashcards
What is a Bohr Diagram?
A Bohr Diagram shows how many electrons an atom/element has in each energy level/shell.
How many electrons can each shell hold?
1st shell can hold 2
2nd shell…can hold 8
3rd shell …can hold 8
Valence Shell
The outermost shell that contains electrons
Stable Octet
A full outer shell of 8 electrons
Valence Electrons
An electron in the valence shell
(These are e- involved in chemical bonding)
Lewis Diagrams
An easier method of showing chemical bonding
What does a Lewis Diagram show?
How many valence electron an atom has and how they’ve been grouped
Grouping electrons
Once there are more than 4 e-, they start to “buddy up”.
Things to notice:
I am an atom with 1 valence electron. Can you tell what group I’m in?
Group 1
Alkali Metals
Think, Pair, Share: I am an atom with 2 electron shells. Can you tell what period I’m in?
Yes,
Period 2
Forming compounds:
What happens when atoms move close together?
Their valence electrons interact
Atoms want to become stable by having a full valence shell. How does that happen?
Atoms will often try to gain or lose electrons to achieve this -turning them into IONS.
What is an ION?
An atom with a net electric charge.
A cation has a positive charge
An anion has a negative charge
What are the two main types of chemical bonding?
- Ionic Bonding - electrons are transferred between atoms.
Example: Na + Cl = NaCl - Covalent Bonding - electrons are shared between atoms.
Atoms vs molecules vs Compounds
Atoms are…
Atoms are the smallest possible pieces of an element
Example: an atom of calcium (Ca)
