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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)

Responses

314
314

226
226

138
138

88

1 answer

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

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

For radium:

  • Mass number = 226
  • Atomic number = 88

Calculating the number of neutrons:

\[ 226 - 88 = 138 \]

So, an atom of radium has 138 neutrons.

The correct response is:

138