Here's why:
* Gold (Au): Gold is an element with an atomic number of 79. This means each gold atom has 79 protons, 79 electrons, and a varying number of neutrons (giving rise to different isotopes of gold). Protons, neutrons, and electrons are all subatomic particles.
* Helium (He): Helium is an element with an atomic number of 2. Each helium atom has 2 protons, 2 electrons, and usually 2 neutrons (though there are isotopes with different numbers of neutrons). Again, these are all subatomic particles.
In summary: All elements, including gold and helium, are composed of atoms. Atoms are made of subatomic particles like protons, neutrons, and electrons.
