* Subatomic particles in the nucleus: The nucleus of an atom contains protons and neutrons.

* Protons determine the element: The number of protons defines the atomic number, which uniquely identifies an element.

* Neutrons affect isotopes: The number of neutrons can vary, creating isotopes of the same element.

To find the element:

1. We need to know the number of protons. Since we only have the total number of particles in the nucleus (28), we can't determine the exact number of protons without more information.

Example:

* If the atom has 14 protons, it would be Silicon (Si), with 14 neutrons.

* If the atom has 10 protons, it would be Neon (Ne), with 18 neutrons.

To find the element, you need to know either the number of protons or the number of neutrons.