객관식
An isotope has a mass number of 193 and contains 116 neutrons. What is the atomic number of this isotope?
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2. Atoms & Elements
Isotopes
Multiple Choice
How many protons are present in an isotope of sodium with a mass number of 25?
A
11
B
25
C
14
D
12
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검증된 단계별 안내1
Recall that the number of protons in an element is equal to its atomic number, which is unique for each element.
Identify the element in question: sodium (Na). Sodium has an atomic number of 11, meaning it has 11 protons.
Understand that the mass number (given as 25) is the sum of protons and neutrons in the nucleus of the isotope.
Since the question asks for the number of protons, focus on the atomic number rather than the mass number.
Conclude that the isotope of sodium with a mass number of 25 still has 11 protons, as the number of protons does not change between isotopes.
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