Multiple Choice
An atom has 53 protons and 74 neutrons. Which isotope is it?
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4. Atoms and Elements
Isotopes
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An atom has 31 protons and 37 neutrons. What element is it?
A
Gallium (Ga)
B
Arsenic (As)
C
Germanium (Ge)
D
Zinc (Zn)
Verified step by step guidance1
Identify the atomic number of the atom, which is equal to the number of protons. Here, the atom has 31 protons, so its atomic number is 31.
Recall that the atomic number uniquely identifies an element on the periodic table. Each element has a specific atomic number corresponding to the number of protons in its nucleus.
Use the atomic number (31) to find the element on the periodic table. Look for the element with atomic number 31.
Check the options given and match the atomic number 31 to the correct element symbol and name.
Confirm that the element with atomic number 31 is Gallium (Ga), which matches the number of protons given.
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