객관식
Which of the following is the correct chemical symbol for an element on the periodic table?
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2. Atoms & Elements
Periodic Table: Element Symbols
객관식
Which of the following is the atomic number of helium?
A
4
B
2
C
10
D
1
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검증된 단계별 안내1
Recall that the atomic number of an element is the number of protons in the nucleus of an atom of that element.
Identify helium on the periodic table, where it is located in Group 18 and Period 1.
Note that helium has 2 protons in its nucleus, which defines its atomic number.
Understand that the atomic mass (approximately 4 for helium) is different from the atomic number.
Therefore, the atomic number of helium is 2, not 4, 10, or 1.
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