객관식
Which of the following elements has the lowest atomic mass?
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2. Atoms & Elements
Atomic Mass
객관식
The atomic mass of an element is equal to the number of:
A
protons and neutrons in the nucleus
B
protons in the nucleus
C
electrons in the atom
D
neutrons in the nucleus
검증된 단계별 안내1
Understand that the atomic mass (also called mass number) of an element represents the total number of heavy particles in the nucleus of an atom.
Recall that the nucleus contains protons and neutrons, both of which contribute significantly to the atomic mass because they have nearly equal mass.
Recognize that electrons have negligible mass compared to protons and neutrons, so they do not significantly affect the atomic mass.
Therefore, the atomic mass is the sum of the number of protons and neutrons in the nucleus.
Conclude that the correct description of atomic mass is the number of protons and neutrons in the nucleus.
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