Question

general characteristics of second transaction (4D) series elements​

Answer 1

The presence of partially filled d-orbitaIs in the electronic configuration of atomic and ionic species of these elements is responsible for the characteristic properties of transition elements. They are called transition elements because of their position in the periodic table.

Properties of transition elements include:

have large charge/radius ratio;

are hard and have high densities;

have high melting and boiling points;

form compounds which are often paramagnetic;

show variable oxidation states;

form coloured ions and compounds;

form compounds with profound catalytic activity;

(i) Their melting and boiling points are very high that are attributed to the involvement of (n-1)d electrons resulting into strong interatomic bonding. (ii) They exhibit paramagnetic behaviour, variable oxidation states, catalytic properties and tendency for the formation of coloured ions and complexes

Explanation:

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Answer 2

Explanation:

Actinium, Ac, is the first member of the fourth transition series, which also includes Rf through Rg. Figure 23.1. 2: The transition metals are located in groups 3–11 of the periodic table....Properties and Trends in Transition Metals.Element CuGroup 11density /g cm-3 8.92m. p. / °C 1083b.p. / °C 2567.

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