객관식
An electron and a proton are fixed at a separation distance of 1.0 nm. What is the magnitude of the electrostatic force between them?
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2. Atoms & Elements
The Atom
Multiple Choice
Which of the following is the atomic number of boron?
A
13
B
5
C
11
D
6
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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 boron on the periodic table to find its atomic number.
Note that boron is located in period 2 and group 13 of the periodic table.
The atomic number corresponds to the position of the element in the periodic table, which for boron is 5.
Therefore, the atomic number of boron is 5, meaning it has 5 protons in its nucleus.
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