AO
Assessment (Post-Test)
Direction: Choose the letter of the best answer. Write the letter only.
5
.
1. Which of the following particles is not found in the nucleus?
A Proton
C. Electron
B. Neutron
D. Quarks
2. Which of the following statements is NOT correct?
A. The total mass of the protons and neutrons in an atom accounts for most of
the mass of the atom.
B. Neutrons have a charge equal to that of electrons.
C. The electron is the first subatomic particle discovered.
D. Electrons are negatively charge.
3. Chromium has a mass number 52 and atomic number of 24. Solve for number of
protons?
A. 24
C. 52
B. 28
D. 76
4. They were considered the front runners of scientific studies?
A. Egyptians
C. Romans
B. Greeks
D. Americans
How do you put electric charge to an object?
A. By hanging
C. By cutting
B. By biting
D. By rubbing
6. In a Bismuth atom, the atomic mass 209, Atomic number is 83. How many numbers
of neutrons does it contain?
A. 209
C. 83
B. 126
D. 292
7.
In an atom of zinc, 30Zn65, the respective numbers of protons, neutrons, and
electrons are:
A. 30, 35, 30
C. 30, 65, 35
B. 30, 65, 35
D. 65, 35, 30
8. What did J.J. Thompson contribute to the development of knowledge concerning
atom?
A. He discovered the proton
C. He discovered the neutron
B. He discovered the electron
D. Her established the existence of a
positive
9. In a Fluorine atom 9 F19, what is the number neutrons?
A. 29
C. 10
B. 38
D. 9
10. If an atom has 24 protons and 24 electrons, what is the atomic number of this
element?
A. Zero
C. 48
B. 24
D. 42