Hafnium (Hf). Diagram of the nuclear composition,electron configuration,chemical data,and valence orbitals of an atom of hafnium-178 (atomic number: 72),the most common isotope of this element. The nucleus consists of 72 protons (red) and 106 neutrons (orange). 72 electrons (white) successively occupy available electron shells (rings). Hafnium is a transition metal in group 4,period 6,and the d-block of the periodic table. It has a melting point of 2233 degrees Celsius. The trends across the transition metals are due to electrons filling an inner d-subshell (here,within the 5th ring),shielding the outer (valence) electrons from the increasing nuclear charge | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Clarivan, Carlos |
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