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Unit 2 Quiz
By Erin Sall
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Last updated over 5 years ago
10 questions
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Question 1
1.
What Greek philosopher was the first person to propose the idea that matter is made of tiny individual particles called atoms?
Bohr
Democritus
Rutherford
Dalton
Question 2
2.
All atoms of an element have the same
atomic mass
number of neutrons
atomic number
number of nucleons
Question 3
3.
The mass number of an atom is equal to the number of
electrons plus protons
protons, only
neutrons plus protons
neutrons, only
Question 4
4.
Compared to an atom of C-12, an atom of C-14 has
fewer protons
more protons
fewer neutrons
more neutrons
Question 5
5.
Which atom contains exactly 15 protons?
phosphorus-32
oxygen-15
sulfur-32
nitrogen-15
Question 6
6.
What is the total number of valence electrons in an atom with a total of 13 protons?
1
2
3
4
Question 7
7.
The development of the cathode ray tube led to the discovery of what subatomic particle?
positron
proton
neutron
electron
Question 8
8.
27
59
32
86
Question 9
9.
What term refers to the region of an atom where an electron is
most
likely to be found?
orbit
orbital
quantum
spectrum
Question 10
10.
Find the average mass of a sample of neon which contains 90.92% Ne-20 and 9.08% Ne-22. [Show all work.] [Round answer to the nearest hundreth.]
visibility
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