How many neutrons are there in an atom of lead whose mass number is 208?
A) 82
B) 126
C) 208
D) 290
E) none of them

Name: How many neutrons are there in an atom of lead whose mass number is 208? A) 82 B) 126 C) 208 D) 290 E) none of them
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Question

Quizplus · Accepted Answer

The mass number of an atom is the sum of its protons and neutrons. Since the atomic number of lead is 82 (meaning it has 82 protons), subtracting the atomic number from the mass number gives the number of neutrons: 208 - 82 = 126. Therefore, the correct answer is B.

How Many Neutrons Are There in an Atom of Lead