To determine the number of core electrons in a cadmium (Cd) atom, let’s first write its electron configuration.
Ground-state means that cadmium is in its lowest energy form (not in excited state). Carbon also has no charge (neutral element) which means that no electrons are removed or added to the atom.
Neutral element: Atomic number = # protons = # of electrons
s orbital → can hold a maximum of 2 electrons
p orbitals → can hold a maximum of 6 electrons
d orbitals → can hold a maximum of 10 electrons
f orbitals → can hold a maximum of 14 electrons
From the periodic table, we can see that Cd is in Period 5 and d-block.
Give the number of valence electrons for Cd
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