Answer:
30
Explanation:
atomic mass = proton number + neutron number
proton number is also atomic number
An iron atom has an atomic mass of 56, its atomic number is 26 so the number of neutrons in it is 30.
Atomic mass of any substance will be calculated by the sum of the masses of protons and neutrons present in the atom.
Atomic number (Z) of any atom is equal to the number of protons or electrons present in that atom. Relation between atomic mass, atomic number and number of neutrons will be represnted as:
No. of neutrons = Atomic mass - Atomic number
On putting values for iron atom according to the question, we get
No. of neutrons = 56 - 26 = 30
So, number of neutrons is 30.
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