What is the key difference between the mass number and the atomic number of an element?

Mass Spectrometry and Atomic Structure

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Chemistry
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9th - 10th Grade
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Hard

Patricia Brown
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Mass number and atomic number are always equal.
Mass number is always smaller than atomic number.
Mass number is the sum of protons and neutrons, while atomic number is the number of protons.
Atomic number is the sum of protons and neutrons, while mass number is the number of protons.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
For a neutral atom of potassium, what can be said about its protons and electrons?
It has no electrons.
It has an equal number of protons and electrons.
It has more electrons than protons.
It has more protons than electrons.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is carbon-12 used as a standard for relative atomic mass?
Because it is a gas at room temperature.
Because it is the heaviest element.
Because it is the lightest element.
Because its exact AR is close to 12.000 and it is easily attainable.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What defines an isotope of an element?
Same number of electrons but different number of protons.
Same number of protons and neutrons.
Same number of neutrons but different number of protons.
Same number of protons but different number of neutrons.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the presence of isotopes affect the relative atomic mass of an element?
It makes the relative atomic mass a whole number.
It does not affect the relative atomic mass.
It makes the relative atomic mass equal to the mass number.
It causes the relative atomic mass to be a weighted average.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the purpose of a mass spectrometer in the context of atomic structure?
To determine the color of an element.
To count the number of electrons in an atom.
To ionize atoms and measure their mass-to-charge ratio.
To measure the temperature of an element.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a mass spectrometer, what does the x-axis typically represent?
Mass-to-charge ratio
Relative abundance
Time
Height of peak
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