Question

the atom of an element is made up of protons and neutrons and electrons what is it atomic number and mass number​

Answer 1

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Together, the number of protons and the number of neutrons determine an element's mass number. Since an element's isotopes have slightly different mass numbers, the atomic mass is calculated by obtaining the mean of the mass numbers for its isotopes.

Answer 2

Explanation:

the atom of an element is made up of protons and neutrons and electrons what is it atomic number and mass number

Together, the number of protons and the number of neutrons determine an element's mass number. Since an element's isotopes have slightly different mass numbers, the atomic mass is calculated by obtaining the mean of the mass numbers for its isotopes.