Name _____________________________________________________
Assigned Th 9/18 Due M 9/22
Atomic Homework
Give the atomic number and average atomic mass of each of the following elements.
Element
1) Copper
Atomic Number
Average Atomic Mass
2) Phosphorous
3) Arsenic
4) Krypton
5) Beryllium
Give the number of protons, electrons, and neutrons found in each of the following isotopes.
Isotope
6) Sulfur-32
Number of Protons
Number of Electrons
7) Phosphorous-31
8) Silver-109
9) Calcium-41
10) Lithium-7
Write the isotope notation for each of the following.
11) Manganese-50
15) Iron-51
12) Silicon-30
16) Cobalt-70
13) Oxygen-16
17) Beryllium-10
14) Sulfur-34
18) Fluorine-23
Number of Neutrons
Name the scientist behind each accomplishment.
19) Created the “plum pudding” model the atom
20) Discovered the neutron
_______________________________
_______________________________
21) Created the “planetary” model of the atom
_______________________________
22) Determined that matter is not created or destroyed in chemical reaction. _______________
23) Proposed a cloud model of the atom
_______________________________
Answer the following questions.
24) According to atomic theory, all matter is made of _____________.
25) Which two subatomic particles are relatively massive? ___________________________
26) Which subatomic particle is smaller than these two? _____________________
27) Isotopes have the same number of _________________ and the same number of _______________, but
different numbers of __________________ and different atomic _______________.
28) The three major isotope of calcium are calcium-40 (96.9%), calcium-42 (0.6%), and calcium-44 (2.5%).
Using this information, calculate the average atomic mass of calcium. Show all of your work below and box
in your answer.
29) There are four naturally-occurring lead isotopes: lead-204 (1.4%), lead-205 (24.1%), lead-206 (22.1%) and
lead-208 (52.4)%. Using this information, calculate the average atomic mass of lead. Show all of your work
below and box in your answer.