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CHEM 104 MODULE 1 PRACTICE EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2025

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CHEM 104 MODULE 1 PRACTICE EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2025

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CHEM 104 MODULE 1 PRACTICE EXAM
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2025


1. Which subatomic particle has a negative charge?

A. Proton
B. Neutron
C. Electron
D. Nucleus
Electrons are negatively charged particles that orbit the nucleus.



2. The mass number of an atom is equal to the sum of:

A. Protons only
B. Electrons and neutrons
C. Protons and neutrons
D. Protons and electrons


1|Page

,The mass number includes only protons and neutrons since electrons have
negligible mass.



3. Which element has 11 protons?

A. Magnesium
B. Sodium
C. Potassium
D. Neon
Sodium has an atomic number of 11, which equals the number of protons.



4. Isotopes of an element differ in the number of:

A. Protons
B. Electrons
C. Neutrons
D. Orbitals
Isotopes have the same number of protons but different numbers of neutrons.



5. The atomic number of an element is the number of:

A. Neutrons
B. Electrons in a neutral atom
C. Protons
D. Protons plus neutrons
The atomic number equals the number of protons.

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, 6. Which of the following is a metalloid?

A. Sodium
B. Oxygen
C. Silicon
D. Potassium
Silicon is one of the common metalloids, having properties of both metals and
nonmetals.



7. Which element is a noble gas?

A. Nitrogen
B. Neon
C. Fluorine
D. Hydrogen
Neon is a noble gas, located in Group 18.



8. What is the charge on an ion with 17 protons and 18 electrons?

A. +1
B. +2
C. -1
D. 0
The extra electron gives the ion a -1 charge.



3|Page

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