To find the number of neutrons in an atom, subtract the atomic number from the mass number.
Mass number - Atomic number = Number of neutrons
210 - 85 = 125
Therefore, the atom has 125 neutrons.
An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
*
85
125
210
295
1 answer
1 answer