Name: ____________________________
Chemistry Period: __________
Ions, Isotopes, Atoms Practice
Directions:
Complete the following table.
Hyphen
Notation
Oxygen - 17
Bromine - 80
Silver - 109
Copper - 65
Aluminum - 27
Strontium - 84
Chlorine - 36
Potassium - 41
Nitrogen - 14
Sodium - 22
Xenon - 126
Nuclear
Symbol
Atomic
#
Mass
Number
#
Protons
#
Neutrons
#
Electrons
Ions Practice:
Name
Group #
# Protons
# Electrons in
ion
Charge
Lithium ion
1
3
2
+1
Calcium ion
Oxygen ion
Nitrogen ion
Aluminum ion
Cesium ion
Chlorine ion
Strontium ion
Sulfur ion
Average Atomic Mass Practice:
Naturally occurring Boron is 80.20% boron-11 (atomic mass = 11.01 amu) and
19.80% of some other isotropic form of boron. What must the atomic mass of this
second isotope be in order to account for the 10.81 amu average atomic mass of boron?
Be sure to show all calculations and express your answer to two decimal places. Don’t
forget units!!