Question

what is electronic configuration of first two elements of group 1 .

Answer 1

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$\\ \\ \\ \huge{ \bold{ \green{group = 1st}}}$
¤¤ Group First is known as the Alkali metals.

¤¤ The valence electron of the elements in this group enters the S-Orbital.

¤¤ For Example, Hydrogen[H], Lithium[Li], Sodium[Na], Potassium[K] , Rubidium[Rb], Cesium[Cs] and Francium [Fr].

▪▪ Hence the first two elements of First Group are Hydrogen and Lithium.

▪▪ Electronic Configuration of Hydrogen ---

$\huge{ \underline{ \bold{ \red{1 \: \: \: \: \: \: \: \: \: or \: \: \: \: \: \: \: \: \: \: \: \: 1 {s}^{1} }}}}$


▪▪ Electronic Configuration of Lithium ------

$\huge {\underline {\bold { \pink{1 \: \: 2 \: \: \: \: \: \: \: \orange{or} \: \: \: \: \: \: \: 1 {s}^{2} \: \: 2 {s}^{1} }}}}$