Review to date
1. How many protons and neutrons are in potassium-40?
2. How do cations form?
3. Identify the isotope containing 18 p+ and 20 n0
4. Calculate the atomic mass of V
50
V
49.947163 g/mol
0.250 %
51
V
50.943964 g/mol
99.750 %
5. Vocabulary to know:
a. Isotope
b. Atomic number
c. Atomic mass
d. Mass number
e. Ion
f. Cation / Anion
g. Polyatomic ion
6. How many protons and electrons are in Y+3
7. What occurs within a neutral sulfur atom to form its common ion?
8. Calculate the atomic mass of Cl
35
34.968853 g/mol
75.78%
37
36.965903 g/mol
24.22%
Cl
Cl
9. Write the symbol for the isotope of Iron with 30 neutrons
10. Form compounds from the following cation / anion pairs
a. Ca+2 and PO4-3
b. Al+3 and OHc. P-3 and NH 4+
Review to date solutions
1. How many protons and neutrons are in potassium-40?
19 p+ and 21 n0
2. How do cations form?
When elements lose electrons
Ar
3. Identify the isotope containing 18 p+ and 20 n0
38
18
4. Calculate the atomic mass of V
50
V
49.947163 g/mol
0.250 %
0.00250
0.1248679075
0.99750
50.81660409
51
V
50.943964 g/mol
99.750 %
50.94147  50.941 g/mol
5. Vocabulary to know:
a. Isotope – elements with same # of p+ but diff # of n0
b. Atomic number – number of protons
c. Atomic mass – weighted average of the isotopes of an element
d. Mass number – sum of protons and neutrons
e. Ion – element with a charge
f. Cation / Anion – positive / negative ion
g. Polyatomic ion – ion made of multiple elements
6. How many protons and electrons are in Y+3
39 p+ and 36 e7. What occurs within a neutral sulfur atom to form its common ion?
It will gain two electrons
8. Calculate the atomic mass of Cl
35
Cl 34.968853 g/mol
75.78%
0.7578
26.4993968
37
Cl
36.965903 g/mol
24.22%
0.2422
8.9531417066
35.452538  35.45 g/mol
9. Write the symbol for the isotope of Iron with 30 neutrons
10. Form compounds from the following cation / anion pairs
a. Ca+2 and PO4-3
Ca3(PO4)2
b. Al+3 and OH-
Al(OH)3
c. P-3 and NH 4+
(NH4)3P
56
26
Fe