Scelta multipla
Which of the following is the correct chemical symbol for an element on the periodic table?
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- 1. Intro to General Chemistry4h 5m
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2. Atoms & Elements
Periodic Table: Element Symbols
Scelta multipla
Which of the following is the atomic number of helium?
A
4
B
2
C
10
D
1
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Guida verificata passo dopo passo1
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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