객관식
How many neutrons are in an atom of sodium (Na) with an atomic mass of 23?
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2. Atoms & Elements
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객관식
What is the mass number for lithium?
A
3
B
6
C
9
D
7
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검증된 단계별 안내1
Understand the concept of mass number: The mass number of an element is the total number of protons and neutrons in the nucleus of an atom.
Identify the atomic number of lithium: Lithium has an atomic number of 3, which means it has 3 protons.
Determine the number of neutrons: The most common isotope of lithium has 4 neutrons. Isotopes are variants of elements with different numbers of neutrons.
Calculate the mass number: Add the number of protons and neutrons together. For lithium, this is 3 protons + 4 neutrons.
Express the mass number using MathML:
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