Multiple Choice
Which term represents the sum of the atomic masses of the atoms in a molecule?
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2. Atoms & Elements
Atomic Mass
Multiple Choice
An atom of lithium has 3 protons and 4 neutrons. What is the atomic mass of this lithium atom?
A
10 amu
B
7 amu
C
4 amu
D
3 amu
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Verified step by step guidance1
Understand that the atomic mass of an atom is the sum of the number of protons and neutrons in its nucleus.
Identify the number of protons in the lithium atom, which is given as 3.
Identify the number of neutrons in the lithium atom, which is given as 4.
Add the number of protons and neutrons together to find the atomic mass: 3 (protons) + 4 (neutrons).
The atomic mass of the lithium atom is the sum calculated in the previous step, expressed in atomic mass units (amu).
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