Chemistry Classification of Elements and Periodicity in Properties

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Z=109 : Unnilennium = Meitnerium

Sn = [Kr]4d105s25p2

Sn (Z = 50) belongs to p-block element.

You can read the classification of elements and periodicity in properties class 11 notes to study class 11 ch3 and score well in class 11th exams and NEET, and JEE exams.

When the elements having similar properties repeat at regular intervals, it is called periodicity in the properties of elements.

Classification of Elements is Necessary because it helps in understanding and remembering elements' properties better, you can understand how elements react or behave, and can guess properties of unidentified or newly discovered elements.

(1) $C{r}^{+1}=4s^{0}3d^{5}M{n}^{+2}=4s^{0}3d^5$ ${}^{}{}^{}{}^{}{}^{}{}^{}{}^{}$

(2) $N{i}^{+2}=4s^{0}3d^{8}C{u}^{+}=4s^{0}3d^{10}$ ${}^{}{}^{}{}^{}{}^{}{}^{}{}^{}$

(3) $F{e}^{+2}=4s^{0}3d^{6}C{o}^{+}=4s^{1}3d^7$ ${}^{}{}^{}{}^{}{}^{}{}^{}{}^{}$

(4) $V^{+2}=4s^{0}3d^{3}C{r}^{+}=4s^{o}3d^5$

1^st ionization energy of N>O in oxygen atom, 2 electrons out of 4 electron of 2p orbital resulting in an increased electron repulsion.

General valence shell electronic configuration of group 16 elements is ns²np⁴.

 For 3^rd period element which is above element “E” is 3s²3p⁴