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)

Answer 1

To find 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 (Ra) with a mass number of 226 and an atomic number of 88:

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

Therefore, an atom of radium has 138 neutrons.