1
2
3
4
5
100
Atom
The smallest particle of an element that retains its identity in a chemical reaction.
100
Electron Cloud
Electrons orbiting the nucleus
100
How to find the number of electrons in an element-
Atomic number
100
Why use an atomic model?
Atoms are to small to be seen- atomic models describe their structure.
100
Valence electrons during bonding are...
lost, gained, or shared between elements.
200
Why do atoms bond together?
To become more stable.
200
Valence electrons and valence shells
the electrons in the outermost energy
200
Atoms with 4 or more valence electrons will likely...
gain electrons to fill the shell.
200
Atoms with 3 or less valence electrons will likely...
lose electrons
200
Atoms with full valence electrons will likely...
not bond or react with other elements.
300
How do atoms combine with other atoms through chemical bonds?
Strong attractive forces that exist between the atoms.
300
Democritus
Believed that atoms were indivisible and indestructible.
300
Covalent bonds
share valence electrons
300
Ionic bonds
transfer valence electrons
300
Metallic bond
pool valence electrons
400
John Dalton
All matter is made of atoms that cannot be created, divided, or destroyed.
"Billiard Ball Model"
400
Cation
lose electrons
positive charge
400
Anion
Gain electrons
Negative charge
400
Niels Bohr
Electrons move in a circular orbit (electron shells) around the nucleus at a fixed distance.
400
J.J. Thomson
"Plum Pudding Model"
Electrons are embedded in a sphere of positive electrical charge.
500
Ion
an atom that is no longer electrically neutral because it has lost or gained valence electrons.
500
Rutherford
All of an atom's positive charge is concentrated in the nucleus.
500
Erwin Shrodinger
Quantum Mechanical Model (today's model)
500
Write the electron configuration for Sulfur:
Bonus: Draw the electron shell diagram
1s2 2s2 2p6 3s2 3p4
500
Draw the Lewis Dot structure for Nitrogen
