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

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- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."