Q. Find the number of neutrons present in the element gold , where Z=79, A=197?
Solution:
Atomic number is the number of protons in the element and mass number is the sum of protons and neutrons present in the element. therefore number of neutrons= mass number(A) – atomic number(Z). Here atomic number of gold is 79 and mass number of gold is 197.
Therefore number of neutrons in gold atom = 197-79 =118.
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