Iron occupies the 26th position in the periodic table,and one isotope of iron,⁵⁷Fe,has an atomic mass of about 57.How many neutrons are in the nucleus of this atom?
A) 31
B) 83
C) 26
D) 57

Question

Quizplus · Accepted Answer

The number of neutrons is calculated by subtracting the atomic number (number of protons) from the atomic mass number. For ⁵⁷Fe, the atomic number is 26, so the number of neutrons is 57 - 26 = 31.

Iron Occupies the 26th Position in the Periodic Table,and One