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Atoms – Valence Electrons . Orbital Levels - Review. closest to nucleus – max 2 electrons 2 nd shell – max 8 electrons 3 rd shell – max 8 electrons fill shells closest to nucleus first. Knowing how electrons are arranged in an atom is Important! - PowerPoint PPT Presentation
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Atoms – Valence
Electrons
Orbital Levels - Review• closest to nucleus – max 2
electrons • 2nd shell – max 8 electrons• 3rd shell – max 8 electrons• fill shells closest to nucleus
first
Knowing how electrons are arranged in an atom is
Important!
Electrons control how atoms react with each
other!
H
H
O
Atoms want their outer most shell to be full and will lose or gain extra electrons to achieve that…
Electrons on the outer most orbital have a special name: Valence Electrons
HAPPY ATOMS
Vocabulary Check:
• Valence Electron – located on the outer most orbital (shell)–determine reactivity–same for all members of a group/family–Last digit of group # = # of valence e-
Sodium
NUCLEUS
---
--
--
--
--
VALENCE
1H
Hydrogen1
3Li
Lithium7
11Na
Sodium23
19K
Potassium39
37Rb
Rubidium85
1
Chlorine
NUCLEUS
- --
---
- --
--
--
--
--
9F
Fluorine19
17Cl
Chlorine35
35Br
Bromine80
53I
Iodine127
85At
Astatine210
17
How many Valence Electrons?
Chlorine
NUCLEUS
- ---
--
-- ----
- --
--NUCLEU
S--
- -
- ---
--
-
SodiumSodium Chloride“SALT”
Journal Questions
1. Define Valence Electron.
2. What is the significance of valence electrons?
3. Use your periodic table to figure out how many valence electrons Magnesium has. Explain Magnesium’s reactivity using it’s valence number.
