zinc :)
zinc
2 valence electrons are in iridium because iridium is a transition metal. Most transitions metal would have 2 valence electrons because the group before the transition metals are the alkaline-earth metals which contains 2 valence electrons in that group making the transition metals have 2 valence electrons.
Zinc
The number of unpaired electrons in a transition metal ion is directly related to its hardness. Transition metals with more unpaired electrons tend to be harder because the unpaired electrons can participate in bonding interactions, making the metal more resistant to deformation. This is known as the relationship between hardness and the d-orbital occupancy of transition metals.
The transition metal with 24 electrons is chromium (Cr) and its common ion with a +3 charge is Cr3+.
Thorium (Th) is an inner transition metal with 90 electrons. It is a radioactive element that belongs to the actinide series of the periodic table.
Zinc.
Because the metals, have some physical property in them which is really helpful in making paints for more information about this http://www.google.co.th/#hl=en&biw=1366&bih=643&&sa=X&ei=FqRrTYrfKYbKrAflj-XCCw&ved=0CBUQvwUoAQ&q=why+are+transition+metals+used+in+making+paints&spell=1&fp=78a711645601c073
they are making metal bonds. that is the purpose.
Transition metals typically lose 1, 2, or 3 electrons to achieve a stable electron configuration. This helps them attain a full or half-full d subshell, which is more stable than an incomplete d subshell. The number of electrons lost by a transition metal depends on its position in the transition metal series and the specific chemical reaction.
Nickel has 28 electrons when it is neutral, however the Iron(II) ion has 28 electrons as well.
transition metal complexes shows the coloring property due to d-d transition of electrons presnt in d orbital. this transition occurs due to absorbnce of light energy.