.
In atom A how many
protons are there? Ion D? Ion E?
2. In atom A how many
electrons are there? Ion D? Ion
E?
3. How are the 3 diagrams the
same?
4. How are they different?
5. One diagram is listed as an
atom; the other two are listed as
ions. What makes an ion
different from an atom?
6. How does the atomic mass
change when an atom becomes
an ion?
1
Building on the Atom:
Thursday, September 17th, 2015
Ions
Ion – an atom that has gained or lost electrons
Cation - positive charge
- Ion that has lost an electron (e-)
Anion - negative charge
- Ion that has gained an electron (e-)
# protons does not = # electrons
Ion – an atom that has gained or lost electrons
Atomic Symbol vs. Ion Symbol
Oxygen vs. Oxygen (-2)
Sodium vs. Sodium (+1)
Zinc vs. Zinc (2+)
Atomic
Symbol
Ion
Symbol
O
Na
Zn
O-2
Na+
Zn2+
Examples:
Atomic # Atomic Mass p+
Phosphorous (-3) 15
Barium (+2)
56
Complete the Ion
Table + put it in your
notebook
30.974
137.33
n0
e-
15 16 18
56 81 54
Isotope - Variation of a type of atom
•All isotopes of an atom have the same # protons
•Each isotope of an atom has different mass
Therefore,
•Each isotope has a different mass #
•Each isotope has a different # neutrons
same element
different masses
Isotope
Hydrogen-1 Hydrogen-2 Hydrogen-3
Atomic Number
1
Mass Number
# protons
3
1
# neutrons
1
# electrons
1
Nuclear Symbol
Examples:
Atomic #
Nitrogen-12
Nitrogen-14
Sulfur-30
Sulfur-32
Mass #p
#n
#e
Examples:
Atomic #
Nitrogen-12
7
Nitrogen-14
7
Sulfur-30
16
Sulfur-32
16
Mass #p
12
7
14
7
30
16
32
16
#n
5
7
14
16
Complete "An Investigation into
Isotopes"
#e
7
7
16
16