Multiple Choice
A period 5 transition metal has 51 neutrons. If the element is yttrium, what is the mass number of this isotope? (Atomic number of Y is .)
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4. Atoms and Elements
Isotopes
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Which element has 16 protons and 16 neutrons in its nucleus?
A
Argon
B
Sulfur
C
Chlorine
D
Phosphorus
Verified step by step guidance1
Identify the number of protons given in the problem, which is 16. The number of protons in an atom defines the element and is called the atomic number.
Recall that the atomic number corresponds to the element's position on the periodic table. Find the element with atomic number 16.
Understand that the number of neutrons plus the number of protons gives the mass number of the isotope. Here, the mass number is 16 protons + 16 neutrons = 32.
Recognize that the element with atomic number 16 is sulfur (S), and the isotope with 16 neutrons is sulfur-32, a common isotope of sulfur.
Conclude that the element with 16 protons and 16 neutrons is sulfur, based on its atomic number and isotope mass number.
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