How many protons (p)and neutrons (n)are in an atom of barium-130?
A)56 p,74 n
B)56 p,130 n
C)74 p,56 n
D)130 p,56 n

Name: How many protons (p)and neutrons (n)are in an atom of barium-130? A)56 p,74 n B)56 p,130 n C)74 p,56 n D)130 p,56 n
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Question

Quizplus · Accepted Answer

The atomic number of barium is 56, which means it has 56 protons. The mass number of barium-130 is 130, which means it has 130 nucleons (protons and neutrons combined). Subtracting 56 from 130 gives 74 neutrons, so the correct answer is A.

How Many Protons (P)and Neutrons (N)are in an Atom of Barium-130