![]() The table below lists the first ionisation energy of a number of transition metals and of non-transition (main group) metals. Ionisation energy (ionization energy) is the energy required to remove an electron form a gaseous atom. ![]() Ionisation Energy and Chemical Reactivity of the Transition Metals These atoms of smaller volume can pack together more closely resulting in higher densities and hardness.Ĭloser packing results in stronger bonding so more energy is required to melt or boil transition metals. This is because transition metals have smaller atomic volumes than Group 1 and 2 metals because additional electrons are being progressively added to the inner atomic orbitals resulting in stronger attraction to the nucleus.
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