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 plato

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

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

Atomic mass = Number of protons  + Number of neutrons

or,

Atomic mass = Atomic number  + Number of neutrons

As we are given that,

The element is. Fe

Atomic number = 26

Mass number or atomic mass = 56

Atomic mass = Atomic number  + Number of neutrons

Number of neutrons = Atomic mass - Atomic number

Number of neutrons = 56 - 26

Number of neutrons = 30

Therefore, the number of neutrons are, 30

i do not get it   at all

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