1. IONS...

2. In order to understand
what ions are,
we need to know that…

3. positive or negative charge
the particles
that make up atoms
have either
positive or negative charge +

4. positive and negative are opposites+ +
they cancel each other out + + +

5. +
net charge = zero + + + +

6. the positive (+) particle is called a
proton +

7. the negative (-) particle is called an
electron

8. in an atom, protons ( ) are in the center and electrons ( )
are on the outside + + + + + +

9. only electrons ( )
can be added
or taken away + + + + +

10. this is an atom with
5 electrons and
5 protons + + + + +

11. the atom is neutral
net charge = zero + + + + +

12. 5 (-) and 5 (+) = zero charge (neutral)

13. + + + + +

14. + + + + +

15. charge = ? + + + + +

16. charge = 1- (one minus) + + + + +

17. + + + + +

18. + + + + +

19. charge = ? + + + +

20. 2+ (two plus) + + + + +

21. WHEN REMOVING ELECTRONS

22. WHEN REMOVING ELECTRONS
THE RESULTING CHARGE IS POSITIVE

23. WHEN REMOVING ELECTRONS
THE RESULTING CHARGE IS POSITIVE 1+
neutral

24. WHEN ADDING ELECTRONS

25. WHEN ADDING ELECTRONS
THE RESULTING CHARGE IS NEGATIVE

26. WHEN ADDING ELECTRONS
THE RESULTING CHARGE IS NEGATIVE 2
neutral

27. An atom with positive or negative charge
is called an
ION
drum roll

28. Atoms with positive or negative charge
SO...
Atoms without charge are called ATOMS
Atoms with positive or negative charge
are called IONS

29. The number of protons in an
AND...
Notice that ONLY the number of e- changes
(Only electrons are added or subtracted)
The number of protons in an
Atom NEVER changes
(why?)

30. Ion: an atom with a positive or negative charge (a charged atom)
Ion charge: an electric charge that forms when an atom gains or loses electrons
If an atom loses electron(s)  positive ion (cation)
If an atom gains electron(s) negative ion (anion)

33. Noble gases are very unreactive because their atoms have filled valence shells.
Filled shells make atoms stable.
Atoms with filled shells do not easily trade or share electrons.
Other atoms gain or lose electrons in order to achieve the stability of noble gases.
Gaining or losing electrons makes atoms into ions.

34. Same electron arrangement as Neon (Ne)

35. Draw the Bohr model for a beryllium (Be) atom.
How does a Be atom become stable?
Draw the Bohr model for a Be ion.

36. Draw the Bohr model for a chlorine (Cl) atom.
How does a chlorine atom become stable?
Draw the Bohr model for a Cl ion.

37. Patterns: Metals lose electrons to form positive ions
Non-metals gain electrons to form negative ions
Ions have a similar electron arrangement to the nearest noble gas