Multiple Choice
In the simplified model of subatomic particles, the positively charged particle in an atom is the:
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4. Atoms and Elements
Subatomic Particles (Simplified)
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In a simplified model of subatomic particles, the mass number of an atom is determined by which of the following?
A
The number of neutrons only
B
The total number of protons and neutrons in the nucleus
C
The number of electrons only
D
The total number of protons and electrons in the atom
Verified step by step guidance1
Understand that the mass number of an atom refers to the total count of particles that contribute significantly to the atom's mass, which are primarily found in the nucleus.
Recall that protons and neutrons are located in the nucleus and have significant mass, while electrons have negligible mass compared to protons and neutrons.
Recognize that the mass number is calculated by adding the number of protons and neutrons together, since these two particles make up the majority of the atom's mass.
Note that electrons do not contribute meaningfully to the mass number because their mass is very small relative to protons and neutrons.
Therefore, the mass number is determined by the total number of protons and neutrons in the nucleus.
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