Zinc is a chemical element with the atomic number 30, which means it has 30 protons in its nucleus. The electronic configuration of zinc is [Ar] 3d10 4s2.
In terms of valence electrons, the electrons in the outermost shell are considered. For zinc, the outermost shell is the 4s orbital, which contains 2 electrons. These two electrons in the 4s orbital are the valence electrons of zinc.
It's worth noting that the electronic configuration of an element can sometimes be a little complex, as it is influenced by factors such as electron shielding and energy levels. However, in the case of zinc, the valence electrons are specifically the two electrons in the 4s orbital.