Using the periodic table, the number of core electrons and the number of valence electrons in iron (Fe) is 8 core electrons and 18 valence electrons.
What are valence electrons?
A valence electron is an electron that is part of an atom's outer shell and can take part in the synthesis of a chemical bond if the outer shell is open. Each atom in the bond contributes one valence electron to create a shared pair in a single covalent bond.
Core electrons are the total number of electrons present in an element. The core electrons do not include valence electrons, and they do not participate in chemical bonding.
Iron Fe, has atomic number 26, [Ar] 3d⁶4s² is the electronic configuration.
Thus, the core electron of Fe is 8, and the valence electrons of Fe are 18.
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