객관식
How many neutrons are present in the nucleus of a standard hydrogen atom?
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2. Atoms & Elements
The Atom
객관식
Which of the following is the mass number of a typical helium atom?
A
4
B
8
C
2
D
6
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검증된 단계별 안내1
Understand that the mass number of an atom is the total number of protons and neutrons in its nucleus.
Recall that a typical helium atom has 2 protons (which defines it as helium) and usually 2 neutrons.
Add the number of protons and neutrons together: mass number = number of protons + number of neutrons.
Calculate the mass number for helium: 2 protons + 2 neutrons = 4.
Recognize that the mass number 4 corresponds to the typical helium atom, so the correct answer is 4.
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