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Element A has 15 protons. Determine the number of neutrons in its isotope with mass number 33.
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Element A has 15 protons. Determine the number of neutrons in its isotope with mass number 33.

User Preetam Singh
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2 Answers

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Number of neutrons is mass number minus number of protons.
So the number of neutrons is 18.
User Zaphoid
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3 votes
A=Z+N
A=mass number (protons + neutrons)
Z=atomic number (number of protons).
N=number of neutrons.

Data:
Z=15
A=33

Then:

33=15+N
N=33-15=18

Answer: the number of neutrons in this element A will be 18.
User Vikrant Thakur
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