Question

Write equation for the reaction of:
A.Sodium with oxygen
B.Magnesium with oxygen

Answer 1

Metals like sodium and magnesium react with non-metals like oxygen to form metal oxides. The alkali earth metals and alkaline earth metals are the chemical elements with metallic nature as they easily lose electrons. Non-metals are halogens and oxygen family elements.

Complete answer:
Periodic table consists of chemical elements arranged in the increasing order of atomic numbers. These elements are arranged in the vertical columns and horizontal rows. The vertical columns were called as groups and the horizontal rows were called as periods. There are a total of $7$ periods and $18$ groups in the periodic table.
Alkali earth metals and alkaline earth metals are placed at the right side of the periodic table. The chemical elements in alkali earth metals and alkaline earth metals are metals. These elements can easily lose electrons.
Metals react with non-metals and form metal oxides.
Sodium is a metal that reacts with oxygen, which is a non-metal and forms sodium oxide.
The chemical reaction will be as follows:
$4Na + {O_2} \to 2N{a_2}O$
Magnesium is a metal that reacts with oxygen, which is a non-metal to form a magnesium oxide.
$2Mg + {O_2} \to 2MgO$
These both compounds are considered as oxides.

Note:
Metal oxides find their applications in different fields. The fields include gas sensors, fuel cells, ceramics, batteries and solar cells. The addition of water to sodium oxide can lead to the formation of sodium hydroxide. Magnesium oxide can be used as an antacid to relieve heartburn and acid indigestion.