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40.6 x 32.8 cm ⏐ 16.0 x 12.9 in (300dpi)
CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY
Diagram of the nuclear composition, electron configuration, and valence orbitals of an atom of zirconium-91 (atomic number: 40), an isotope of this element. The nucleus consists of 40 protons (blue) and 51 neutrons (red). Zirconium is a transition metal in group 4, period 5, and the d-block of the periodic table. It has a melting point of 1855 degrees Celsius. The trends across the transition metals are due to electrons filling an inner d-subshell (here, within the 4th ring), shielding the outer (valence) electrons from the increasing nuclear charge.
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