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Unit 2 Quiz

Last updated over 5 years ago

10 questions

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Question 1

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Question 2

2.

Question 3

3.

Question 4

4.

Question 5

5.

Question 6

6.

Question 7

7.

Question 8

8.

Question 9

9.

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.]

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

All atoms of an element have the same

atomic mass

number of neutrons

atomic number

number of nucleons

The mass number of an atom is equal to the number of

electrons plus protons

protons, only

neutrons plus protons

neutrons, only

Compared to an atom of C-12, an atom of C-14 has

fewer protons

more protons

fewer neutrons

more neutrons

Which atom contains exactly 15 protons?

phosphorus-32

oxygen-15

sulfur-32

nitrogen-15

What is the total number of valence electrons in an atom with a total of 13 protons?

1

2

3

4

The development of the cathode ray tube led to the discovery of what subatomic particle?

positron

proton

neutron

electron

27

59

32

86

What term refers to the region of an atom where an electron is most likely to be found? 

orbit

orbital

quantum

spectrum