The nuclear symbol of an isotope of beryllium is . Indicate the number of protons, number of neutrons, atomic number, and mass number of the isotope.

Explanation:

An isotope is any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.

As a consequence, atoms for the same isotope will have the same atomic number but a different mass number (atomic weight).

In the figure below we see three isomers of Beryllium.

Mass number = proton + neutron

Proton number = atomic number

Mass number – the total number of protons and neutrons in an atomic nucleus.

Atomic mass – the number, equal to the number of protons in an atom that determines its chemical properties. Symbol: Z

increased stability in the completion of fluorine's outer shell.

a corroding iron, if that's one of your choices