electrons lesson and discussions and many more.ppt

Lesson about electrons.

1. Electrons!
Electrons!

2. Chemical Bond
•It refers to the different forces of
attraction that hold the atoms
together.

3. Ionization
•It is a process when an atom
loses, gain or share their
electrons with other atoms.

4. Three points to consider when
identifying a chemical reaction:
•The electron configuration.
• The number of valence
electrons.
•Formation of Lewis
structures.

5. Electron
Configuration and
Valence Electron

6. Electron Configuration
•It describes how the electrons are
arranged and how they moved
from one energy level to the next.

7. Electron Configuration
1s
1
row #
shell #
Main energy level(1-7)
Subshell
possibilities are
s, p, d, or f
group #
# valence e-
possibilities are:
s: 1 or 2
p: 1-6
d: 1-10
f: 1-14
Total e- should equal
Atomic #
What element has an electron configuration of 1s
1
?

8. Order of Electron Subshell Filling:
It does not go “in order”
1s
2
2s
2
2p
6
3p
6
4p
6
5p
6
6p
6
7p
6
3s
2
4s
2
5s
2
6s
2
7s
2
3d
10
4d
10
5d
10
6d
10
4f
14
5f
14
1s
2
2s
2
2p
6
3p
6
3s
2
4s
2
4p
6
5s
2
3d
10
5p
6
6s
2
4d
10
6p
6
7s
2
5d
10
4f
14
7p
6
6d
105f
14

9. 1
2
3
4
5
6
7
6
7
1A
2A
3B4B5B6B7B8B8B8B1B2B
3A4A5A6A7A
8Agroup # = # valence (outside) e-
d p
f
s
Row/Period
=
# shells

10. Practice:
Ask these questions every time you have to write an
electron configuration
•Lithium:
1.What is the atomic number of Li?
2.what is the period number?
3.how many shells?
4.what is the group number?
5.how many valence electrons?
6.what is the electron configuration?
atomic # = 3
2
2
1
1
1s
2
2s
1

11. Practice:
Ask these questions every time you have to write an
electron configuration
•Boron:
1.find the element on the periodic table
2.what is the row #?
3.how many shells?
4.what is the group #?
5.how many valence electrons?
6.what is the electron configuration?
atomic # = 5
2
2
3
3
1s
2
2s
2
2p
1

12. 1
2
3
4
5
6
7
6
7
p
e
r
io
d

#

=

#

e
-

s
h
e
lls
1A
2A
3B4B5B6B7B8B8B8B1B2B
3A4A5A6A7A
8Agroup # = # valence e-
d
f
3d
4d
5d
6d
4f
5f
Subshells d and f are “special”

13. Electron Configuration
1s
1
row #
shell #
possibilities are 1-7
7 rows
subshell
possibilities are
s, p, d, or f
4 subshells
group #
# valence e-
possibilities are:
s: 1 or 2
p: 1-6
d: 1-10
f: 1-14
Total e- should equal
Atomic #
What element has an electron configuration of 1s
1
?

14. Practice:
Ask these questions every time you have to write an
electron configuration
•Lithium:
1.find the element on the periodic table
2.what is the row #?
3.how many shells?
4.what is the group #?
5.how many valence electrons?
6.what subshell(s) does Li have?
7.what is the electron configuration?

15. Practice:
Ask these questions every time you have to write an
electron configuration
•Boron:
1.find the element on the periodic table
2.what is the row #?
3.how many shells?
4.what is the group #?
5.how many valence electrons?
6.what subshell(s) does B have?
7.what is the electron configuration?

16. Order of Electron Subshell Filling:
It does not go “in order”
1s
2
2s
2
2p
6
3p
6
4p
6
5p
6
6p
6
7p
6
3s
2
4s
2
5s
2
6s
2
7s
2
3d
10
4d
10
5d
10
6d
10
4f
14
5f
14