Answer
$Cobalt-59$
Atomic Number: 27
Mass Number: 59
Number of Protons: 27
Number of Neutrons: 59 - 27= 32
Isotope Symbol: $^{59}_{27}CO$
$Cobalt-60$
Atomic Number: 27
Mass Number: 60
Number of Protons: 27
Number of Neutrons: 60 - 27 = 33
Isotope Symbol: $^{60}_{27}CO$
Work Step by Step
Find the atomic number of cobalt from the periodic table.
Atomic number = Number of protons
The mass number is the value in the question (Cobalt- 59, Cobalt-60)
Number of neutrons = mass number - number of protons
"Isotopes are written with the mass number to the upper left of the element symbol and the atomic number to the lower left." (page 343 in the book)
