For fe, its atomic number is 26 and its mass number is 56. how many neutrons does it have? a.26 b.30 c.56 d.82

Answer : The correct option is, (b) 30

Explanation :

Atomic number : It is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number : It is defined as the sum of number of protons and number of neutrons.

Mass number = Number of protons  + Number of neutrons

As we are given that,

Atomic number = 26

Mass number = 56

As we know that:

Atomic number = Number of protons = 26

Mass number = Number of protons  + Number of neutrons

or,

Number of neutrons = Mass number - Number of protons

Number of neutrons = 56 - 26

Number of neutrons = 30

Thus, the number of neutrons in Fe are, 30

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.