Name _____________________________________
Pd ____
Date ________________________
Elements Review Worksheet
1. Isotopes - Write the atomic symbol and hyphen notation for each of the atoms listed below.
Atomic Structure
# of p’s
12
# of n’s
12
# of e’s
12
# of p’s
17
# of n’s
18
# of e’s
17
# of p’s
56
# of n’s
80
# of e’s
56
# of p’s
12
# of n’s
13
# of e’s
12
# of p’s
17
# of n’s
20
# of e’s
17
# of p’s
56
# of n’s
82
# of e’s
56
# of p’s
20
# of n’s
20
# of e’s
20
# of p’s
20
# of n’s
24
# of e’s
20
Chemical
Symbol
Atomic
Symbol
Hyphen Notation
2. Pair up the atoms above that are isotopes of the same element.
3. Average Atomic Mass - Calculate the average atomic mass for each element based on the natural abundance
of its isotopes. Show all your work and the answer should be to the thousandths (3 decimal places) of an
amu.
a. Find the average atomic mass for element A if 7.5% of A atoms are 6A with a mass of 6.0325 amu and
92.5% are 7A with a mass of 7.0133 amu.
b. Find the average atomic mass for element B if 19.9% of B atoms are 9B with a mass of 9.071 amu and
80.1% are 12B with a mass of 12.0093 amu.
c. Find the average atomic mass for element C if 75.78% of C atoms are 32C with a mass of 31.96885 amu,
12.02% are 33C with a mass of 32.9989amu and 12.20% are 37Cl with a mass of 36.8650 amu.
4. Most Abundant Isotope – Using the average atomic mass from the periodic table determine which isotope is
the most abundant and circle it.
a. argon-36
argon-38
argon-40
b. calcium-40
calcium-42
calcium-43
calcium-44
c. nickel-58
nickel-60
nickel-62
nickel-64
calcium-46
calcium-48
5. Ions – For the atoms described below, write the chemical symbol (including charge if appropriate) and
indicate if the atom is neutral, an anion or cation.
# of protons
# of electrons
15
18
37
36
16
18
79
79
9
10
15
10
38
36
30
30
Chemical Symbol
Type of Atom