
PS 04.3 Isotopes and Atomic Mass

Quiz
•
Chemistry
•
10th Grade
•
Medium
+1
Standards-aligned
Robert Fetters
Used 4+ times
FREE Resource
43 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary function of a mass spectrometer?
To measure the speed of light
To determine the average atomic mass
To calculate gravitational force
To analyze sound waves
Answer explanation
The primary function of a mass spectrometer is to determine the average atomic mass of particles by measuring their mass-to-charge ratio, making 'To determine the average atomic mass' the correct choice.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the atomic number?
The number of protons in an atom
The total number of electrons and neutrons
The number of neutrons in an atom
The total number of protons and neutrons
Answer explanation
The atomic number is defined as the number of protons in an atom. This value determines the element's identity and its position in the periodic table, making the first answer choice the correct one.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the mass number?
The number of protons in an atom
The total number of electrons
The total number of protons and neutrons
The number of neutrons in an atom
Answer explanation
The mass number is defined as the total number of protons and neutrons in an atom's nucleus. It reflects the atom's overall mass, as electrons contribute negligibly to mass.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is an isotope?
Atoms with the same number of protons but different numbers of neutrons
Atoms with the same number of neutrons but different numbers of electrons
Atoms with the same number of electrons but different numbers of protons
Atoms with the same number of protons and electrons
Answer explanation
An isotope is defined as atoms that have the same number of protons, which determines the element, but differ in the number of neutrons. This difference in neutrons results in different atomic masses for the isotopes of an element.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the atomic number represent in an atom?
The total number of protons and neutrons
The number of protons in the nucleus
The number of electrons in the outer shell
The total mass of the atom
Answer explanation
The atomic number represents the number of protons in the nucleus of an atom. This defines the element and its properties, making it the correct choice among the options provided.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the mass number of an atom?
The number of protons in the nucleus
The number of electrons in the atom
The total number of protons and neutrons
The number of neutrons only
Answer explanation
The mass number of an atom is the total number of protons and neutrons in its nucleus. This is important because it determines the atom's overall mass and is distinct from the number of electrons or neutrons alone.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is A-Z notation used for?
To represent the number of electrons
To denote the atomic mass
To show the shorthand notation of an atom's composition
To calculate the density of an atom
Answer explanation
A-Z notation is used to represent the shorthand notation of an atom's composition, indicating the element's symbol along with its atomic number and mass number, making it easier to understand atomic structure.
Tags
NGSS.MS-PS1-1
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