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Which of the following best describes the difference between a molecule and an atom?
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2. Atoms & Elements
The Atom
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What is the atomic number of an ion with a +1 charge that contains 18 electrons?
A
20
B
19
C
18
D
17
Guida verificata passo dopo passo1
Recall that the atomic number (Z) of an element is equal to the number of protons in its nucleus.
Understand that the number of electrons in a neutral atom is equal to its atomic number.
Since the ion has a +1 charge, it means it has lost one electron compared to the neutral atom.
Given the ion has 18 electrons, add 1 electron to account for the lost electron to find the number of electrons in the neutral atom: \(18 + 1 = 19\).
Therefore, the atomic number of the element (number of protons) is 19.
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