Chemistry Worksheet Template Page 3
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4Homework:
1. Which part of Dalton’s atomic theory was proven to be incorrect with the discovery of subatomic particles?
2. Fill in the chart below
Subatomic
Discovered
Symbol
Location
Charge
Mass
Particle
by
neutron
electron
proton
3. What makes an atom neutral?
4. What is the relationship between the atomic number of an element and its number of protons?
5. What is the ratio of the mass of a proton to the mass of an electron?
6. What is the relationship between the number of protons & neutrons and an atom’s mass number?
7. What is an isotope?
8. The existence of isotopes, proved which part of Dalton’s atomic theory incorrect?
9. What are two ways that you can represent the isotope of niobium that has 93 as a mass number?
10. What are two ways that you can represent an isotope of bismuth that has 126 neutrons?
11. Write the mass number, atomic number, number of electrons, protons and neutrons for the following isotopes.
207
109
Pb
Ag
a.
b.
82
47
mass # ____________
# neutrons _________
mass # ____________
# neutrons __________
atomic # __________
# electrons _________
atomic # ___________
# electrons __________
name _____________
# protons __________
name ______________
# protons ___________
. 226
257
Ra
Es
c
d.
88
99
mass # ____________
# neutrons _________
mass # ____________
# neutrons __________
atomic # __________
# electrons _________
atomic # ___________
# electrons __________
name _____________
# protons __________
name ______________
# protons ___________
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