Multiple Choice
An atom contains 13 protons. What is the approximate atomic mass of this atom in atomic mass units (u)?
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2. Atoms & Elements
Atomic Mass
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is the atomic number of argon?
A
22
B
18
C
40
D
8
Verified step by step guidance1
Understand that the atomic number of an element is the number of protons in the nucleus of an atom of that element.
Recall that argon is a noble gas found in Group 18 of the periodic table.
Look up argon on the periodic table to find its atomic number, which is the number located above the element symbol.
Identify that the atomic number of argon is 18, meaning it has 18 protons in its nucleus.
Confirm that among the given options (22, 18, 40, 8), the correct atomic number for argon is 18.
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