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
Answer:A
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