Name: ________________________
Period: ____ Date: ___________
Chemistry: Matter Unit L.G. 3
Complete the following chart and answer the questions below.
Element
Name
Atomic
Number
Number of
Protons
Number of
Neutrons
carbon
Mass Number
12
8
8
hydrogen
1
6
hydrogen
14
2
nitrogen
14
1
92
2
146
cesium
82
11
12
47
tungsten
108
110
45
24
80
52
89
silver
152
107
76
114
Name
Period
Date
Bohr Model Diagrams
Use the information provided for each element to draw Bohr Model diagrams. Rather than
drawing individual protons and neutrons, you may simply label how many of each there are in
the nucleus (e.g. He: 2p, 2n). Then, draw the individual electrons on the appropriate energy
levels (keep in mind the maximum number of electrons allowed on each level).
1. Beryllium – atomic #: 4, # of n: 5
2. Sodium – atomic #: 11, # of n: 12
3. Sulfur – atomic #: 16, # of n: 16
4. Fluorine – atomic #: 9, # of n: 10
5. Calcium – atomic #: 20, # of n: 20
6. Argon – Atomic #: 18, # of n: 22
Name: ________________________
Period: ____ Date: ___________
Chemistry: Atoms, Mass, and the Mole
Use appropriate conversion factors and unit cancellation to solve the following problems. In order to get full
credit, you must show the set-up and include units in all quantities.
1. Find the number of atoms of phosphorus (P) in 3.44 moles of phosphorus.
2. What is the mass of 0.38 moles of cobalt (Co)?
3. How many moles of nickel (Ni) is 3.88 x 1025 atoms of nickel?
4. How many atoms is 3.75 moles of iron (Fe)?
5. Find the number of moles of sodium (Na) in 145 g of sodium.
6. How many moles is 0.55 g of magnesium (Mg)?
7. If you have 7.22 x 1023 atoms of chromium (Cr), how many moles of chromium do you have?
8. What mass of tungsten (W) is 35 moles of tungsten?
9. How many atoms is 5.2 moles of titanium (Ti)?
10. How many moles of iron (Fe) is 5.98 x 1024 atoms of iron?
Molar Mass Worksheet
Calculate the molar masses of the following chemicals:
1) Cl2
2) KOH
3) BeCl2
4) FeCl3
5) BF3
6) CCl2F2
7) Mg(OH)2
8) UF6
9) SO2
10) H3PO4