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An element with atomic numbers 29 belongs to:
A. sblock
B. dblock
C. pblock
D. fblock

Answer
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Hint: Atomic number of an element is defined as the unit positive charge present in the nucleus i.e. number of protons. The distribution of electrons in various subshells of an atom is called its electronic configuration. The location of any element in the periodic table is reflected by the quantum number of the last orbital filled in an atom.

Complete step by step solution:
The electronic configuration of the element with atomic number 29is written as,
X29=1s22s22p63s23p64s13d10
Now, its obvious from the electronic configuration that the last electron enters in d-orbital so it belongs with d-block. d-block elements are also called transition elements but this is not because its d-orbitals are fully filled so it will behave like a normal metal.
So, the above element with atomic number29belongs to d-block. The d-block elements are the elements of group 3to12in the centre of the periodic table between sblock and pblock elements. These are characterised by filling of inner dorbitals by electrons and therefore referred to as dblock elements. These elements have the general outer electronic configuration(n1)d110ns02. They are called metals. They generally form coloured complexes. Exhibit variable oxidation states, paramagnetic behaviour and used as a catalyst. The dblock elements can also be called as transition elements because of forming a bridge between the chemically active elements of sblock and less active elements of 13thand 14thgroup of pblock.

Hence, the correct option is (B).

Note: One of the most important thing is that the dblock elements Zn, Cd,and Hg do not show most of the properties of transition elements due to electronic configuration(n1)d110ns2. Hence, sometimes called pseudo transition elements. The d-block elements form many compounds out of which an important class is coordination compounds.