The atomic number of an element

The mass number of an element

Isotopes of the same element

Atomic mass

An unstable isotope of an element

Radiation

Nuclear decay occurs when

If a lithium atom (atomic number 3) has a mass number of 7, how many neutrons does it have.

If an Al atom (atomic number 13) has a mass number of 27, how many neutrons does it have.

If a zinc atom (atomic number 30) has a mass number of 66, how many neutrons does it have.

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