Multiple Choice
An atom has 31 protons and 37 neutrons. What element is it?
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4. Atoms and Elements
Isotopes
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Which element is represented by an atom that has 14 protons and 14 neutrons?
A
Aluminum (Al)
B
Silicon (Si)
C
Magnesium (Mg)
D
Phosphorus (P)
Verified step by step guidance1
Identify the atomic number of the element, which is equal to the number of protons in the atom. Here, the atom has 14 protons, so the atomic number is 14.
Recall that the atomic number uniquely identifies an element on the periodic table. Each element has a specific atomic number corresponding to its number of protons.
Look up the element on the periodic table with atomic number 14. This will tell you which element the atom represents.
Note that the number of neutrons (14 in this case) affects the isotope of the element but does not change the element itself.
Conclude that the element with 14 protons is Silicon (Si), regardless of the number of neutrons.
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