객관식
When a lithium atom becomes an ion, which of the following best describes the resulting species?
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2. Atoms & Elements
Ions
Multiple Choice
Chlorine forms a 1- ion known as the chloride ion. How many electrons does a chloride ion have?
A
17
B
16
C
19
D
18
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검증된 단계별 안내1
Identify the atomic number of chlorine, which is 17. This means a neutral chlorine atom has 17 protons and 17 electrons.
Understand that the chloride ion (Cl⁻) is formed when chlorine gains one extra electron.
Calculate the total number of electrons in the chloride ion by adding one electron to the neutral atom's electrons: \(17 + 1\).
Recognize that the number of protons remains the same (17) because the element does not change, only the charge does.
Conclude that the chloride ion has 18 electrons in total.
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