Multiple Choice
An atom has 13 protons, 14 neutrons, and 13 electrons. Which element is it?
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4. Atoms and Elements
Subatomic Particles (Simplified)
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Which element has 49 protons in its nucleus?
A
Indium (In)
B
Gallium (Ga)
C
Tin (Sn)
D
Antimony (Sb)
Verified step by step guidance1
Recall that the number of protons in the nucleus of an atom defines the atomic number of the element.
Identify the atomic number corresponding to each element given in the options: Gallium (Ga), Tin (Sn), Antimony (Sb), and Indium (In).
Use the periodic table to find the atomic number for each element. For example, Gallium has atomic number 31, Tin has 50, Antimony has 51, and Indium has 49.
Match the atomic number 49 to the element with that number of protons, which is Indium (In).
Conclude that the element with 49 protons in its nucleus is Indium (In), since the atomic number equals the number of protons.
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