Multiple Choice
What is the mass number of a potassium (K) atom that has 20 neutrons?
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2. Atoms & Elements
Atomic Mass
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How many protons are present in an atom of krypton?
A
48
B
18
C
36
D
84
Verified step by step guidance1
Recall that the number of protons in an atom is equal to its atomic number, which uniquely identifies the element.
Identify the element given in the problem, which is krypton.
Look up the atomic number of krypton on the periodic table; this number represents the number of protons in one atom of krypton.
Note that the atomic number of krypton is 36, meaning each krypton atom contains 36 protons.
Therefore, the answer to how many protons are present in an atom of krypton is the atomic number, which is 36.
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