Question

what is the difference between mass number and atomic number​

Answer 1

Explanation:

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the mass number is the sum of the protons and neutrons in an atom, the atomic number is only the number of protons. The atomic number is the value found associated with an element on the periodic table because it is the key to the element's identity.

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Answer 2

Explanation:

atomic number = number of protons

Z = P

mass number = no. of protons + no. of neutron

A = P + n

Difference between mass no. & atomic number-

A - Z = P + n - P = n

A - Z = number of neutrons