The element radium has a mass number of 226 and an atomic number of 88. How many neutrons does an atom of radium have?(1 point)

Question

Responses

138
138

226
226

88
88

314

Answer 1

To determine the number of neutrons in an atom, you can use the following formula:

$$\text{Number of neutrons}=\text{Mass number}-\text{Atomic number}$$

For radium:

• Mass number = 226
• Atomic number = 88

Now, plug in the values:

$$\text{Number of neutrons}=226-88=138$$

So, an atom of radium has 138 neutrons.