Independent Practice 1
Unit 3: Atomic Theory & Periodicity
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Learning Target A: Atomic Information & Learning Target B: Isotopes & Relative Atomic Mass
1. Complete the following table.
Subatomic
Particle
Proton
Charge?
Location in
the atom?
How do you determine it from the periodic
table?
Neutron
Electron
2. Consider the following: 195
78𝑃𝑡
a. What is the atomic number?
b. What is the atomic mass?
c. How many protons?
d. How many neutrons?
e. How many electrons?
3. Consider the following: Chlorine-35.
a. Write the atomic/isotope notation.
b. Draw a Bohr model.
c. How many valence electrons does Chlorine-35 have?
4. Define isotope.
5. Write the atomic notation for two possible isotopes of Aluminum
6. Silver has two isotopes, Silver-107 (52%) and Silver-109 (48%), calculate the average atomic mass
for silver. SHOW YOUR WORK!
7. Consider this fictional element Xy. Xy has an average atomic mass of 705 and is made up of two
isotopes. One Isotope, Xy-706 is 83% abundant. What is the other isotope?