Question

A metal X is in the first group of periodic table.What will be the formula of it’s oxide?

Answer 1

Hint: The modern periodic table is considered to be the most accurate classification of elements to be ever put to use. The elements are placed in over 18 groups and they show resemblance in their chemical behavior. These four blocks are all namely $s,p,d$ and $f$.

Complete answer:
The chemical elements which are found in Group 1 of the periodic table are known as alkali metals. The alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium. Although hydrogen is listed in Group 1 due to its electronic configuration, technically it cannot be considered as an alkali metal since it rarely exhibits similar behavior. The word "alkali" has been derived from the Arabic word "al qali," meaning "from ashes", since these elements react with water to form hydroxide ions, creating alkaline solutions (pH>7).
When an oxygen atom reacts with a metal atom we get metal oxides. They are crystalline solids that contain a metal cation and an oxide anion and typically react with water to form bases or with acids to form salts.
The valency of Oxygen is $ - 2$ whereas the valency of any metal $X$ which is placed in the first group of the periodic table will be $ + 1$ . Hence formula of its oxides will be ${X_2}O$

Note:
Alkali metals are considered one of the most reactive metals. Their high reactivity is attributed to their larger atomic radii and low ionization energies. Since they tend to donate their electrons in reactions they have an oxidation state of +1. These metals are characterized by their soft texture and silvery color.