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Atoms, Ions, Isotopes
Transcript of Atoms, Ions, Isotopes
Get into teams as instructed
Round robin the whiteboard (everyone will answer when it is their turn)
Do not blurt out answers!!!
Write them down and be the first to display it.
Each correct answer the quickest is +1 point.
Isotopes are variants (types) of chemical elements.
We know that the atomic mass is equal to the number of ____ and ______.
# of protons DOES NOT CHANGE.
Different #'s of NEUTRONS
An ion is an atom in which the number of electrons is NOT equal to the number of protons.
This difference in the number of positive particles (protons) to negative particles (electrons) gives the atom a net negative or positive charge.
# of protons DOES NOT CHANGE!!!
depicts electrons "orbiting" the nucleus of an atom.
illustrates energy orbitals and their capacity (2,8,18)
Lewis Dot diagram
Focuses on the valence electrons.
Ions have the same number of _______ but have different numbers of ______ than the neutral atom.
Isotopes have the same number of _____ and ______ but have different numbers of _______ than a chemical element.
The electron(s) that occupy the outermost orbital of an atom.
If an atom gains an electron, it becomes more _______ charged and is called an ______.
If an atom looses an electron, it becomes more ______ charged and is called a____.
-Draw the Bohr Model for Li (lithium) and for N (nitrogen) that shows the protons, neutrons and orbiting electrons.
-Take out Bohr Model homework
and turn if if you haven't already
By the end of the class the student will:
-explain how ions and isotopes form in using how the number of electrons change and neutrons change.
-draw Lewis dot models of the first 20 elements.
Most basic unit of matter
Consists of three particles:
Protons (+) and Neutrons (neutral)
Surrounding the Nucleus
Electrons (-) Orbitals (2,8,18)
Classified according to the number of protons
# of protons = Atomic #
# of electrons = # of protons = Atomic #
# of neutrons = (?) - (?)
HOW DOES THIS HAPPEN???
Lewis Dot Diagram
Named after Gilbert N. Lewis, introduced in 1916.
Lewis dot diagrams show the valence electrons and the symbol of the element.
Lines are drawn connecting electrons to show bonds.
Draw the Bohr Model for Na (sodium)
- 5 minutes
- Complete the "Lewis Dot Diagram Worksheet"
- You are to fill in the missing numbers
- Create the Bohr Models
- Create the Lewis Dot Models
--> DUE NEXT CLASS!!!!!!!!!!
- Draw the Bohr Model for Carbon
- Draw Carbon's Lewis Dot Diagram
LEWIS DOT HOMEWORK!!
- What do the periods of the periodic table tell us about the number of electron orbitals for a Bohr model?
- What do the group/families tell us about valence electrons for any given element?
- Draw the Lewis dot model for Carbon.
- What two things do lewis dot diagrams show?
- Which electrons can form bonds? paired or unpaired?