Unit 1: Atoms and Molecules Exam 2026
Questions and Answers
What is the atomic and mass number - Correct answer-The atomic number is the
number of protons. The mass number is the total number of protons and neutrons
in a nucleus.
List the charges, symbols, and relative masses of protons, neutrons, and electrons. -
Correct answer-Protons p+, 1+ charge, and 1 amu
Neutrons n0, 0+ charge, and negligible mass
Electrons e-. 1- charge, and 1 amu
What does the group and period tell you about the element - Correct answer-Group
= Number of valence electrons and distance from 18 is the number of bonds it will
make
Period = how many shells there are
Define a chemical bond. - Correct answer-A chemical bond is the force of
attraction that holds atoms together as a result of the rearrangement of electrons
between them.
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, What are the four types of chemical bonds. - Correct answer-ionic, metallic,
molecular covalent, network covalent
Ionic bonds are between a non-metal and a metal, and there is a transfer of
electrons.
Metallic bonds are between 2 metals, and all atoms take off their electrons to form
a delocalized sea of electrons
Molecular covalent bonds are between 2 non metals and are small molecules made
up of small covalent bonds.
Network covalent bonds are large covalent structures in regular repeating lattices.
What are the halogens? - Correct answer-Group 17, all have 7 valence electrons
making it very reactive.
What are the alkali metals? - Correct answer-Group 1 besides Hydrogen, all have 1
valence electron, making them very reactive.
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Questions and Answers
What is the atomic and mass number - Correct answer-The atomic number is the
number of protons. The mass number is the total number of protons and neutrons
in a nucleus.
List the charges, symbols, and relative masses of protons, neutrons, and electrons. -
Correct answer-Protons p+, 1+ charge, and 1 amu
Neutrons n0, 0+ charge, and negligible mass
Electrons e-. 1- charge, and 1 amu
What does the group and period tell you about the element - Correct answer-Group
= Number of valence electrons and distance from 18 is the number of bonds it will
make
Period = how many shells there are
Define a chemical bond. - Correct answer-A chemical bond is the force of
attraction that holds atoms together as a result of the rearrangement of electrons
between them.
©COPYRIGHT 2026, ALL RIGHTS RESERVED 1
, What are the four types of chemical bonds. - Correct answer-ionic, metallic,
molecular covalent, network covalent
Ionic bonds are between a non-metal and a metal, and there is a transfer of
electrons.
Metallic bonds are between 2 metals, and all atoms take off their electrons to form
a delocalized sea of electrons
Molecular covalent bonds are between 2 non metals and are small molecules made
up of small covalent bonds.
Network covalent bonds are large covalent structures in regular repeating lattices.
What are the halogens? - Correct answer-Group 17, all have 7 valence electrons
making it very reactive.
What are the alkali metals? - Correct answer-Group 1 besides Hydrogen, all have 1
valence electron, making them very reactive.
©COPYRIGHT 2026, ALL RIGHTS RESERVED 2
