This is how osmium appears in the periodic table.A purple box has O s at the center and 76 above. Below it says osmium and below that 190.23.
Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium?
76
114
190
266
To calculate the number of neutrons in an atom, you need to subtract the atomic number from the atomic mass.
Atomic number (number of protons) = 76
Atomic mass (nearest whole number) = 190
Neutrons = Atomic mass - Atomic number
Neutrons = 190 - 76
Neutrons = 114
Rounded to the nearest whole number, there are 114 neutrons in an atom of osmium.