Subtraction Word Problem

1) Here Is a Picture of the Three Isotopes of Carbon. Find Their Number of Neutrons.

The number of neutrons in the C-12 atom is
12 – 6 = 6

The number of neutrons in the C-13 atom is
13 – 6 = 7

The number of neutrons in the C-13 atom is
14 – 6 = 8

2) Nickel (Z = 28, a = 58) Has 30 Isotopes That Have the Same Atomic
Number. But Their Atomic Masses Range From a = 48 to a = 78. a) How Many Neutrons Does the Lightest Isotope of Nickel Have?
b) How Many Neutrons Does the Heaviest Isotope of Nickel Have?

1. The lightest isotope of nickel has A = 48.
   so, the number of neutrons = 48 – 28 = 20
2. The heaviest isotope of nickel has A = 78
   So, the number of neutrons = 48 – 78 = 30

3) Here Is a List of Isotopes of Plutonium. Find Their Number of Neutrons.

 

 

4) Here Is a List of Elements With Their Atomic Mass And Atomic Numbers. Find the Number of Neutrons of the Elements.