An element having configuration 1s2 2s2 2p6 3s2 3p6 4s1 will form:

This element belongs to group 1 i.e. alkali metals group and metallic oxides are basic.

What are Oxides?

Oxides are binary compounds formed by the reaction of oxygen with other elements. The classification of oxides is done into neutral, amphoteric and basic or acidic based on their acid-base characteristics.

  • An acidic oxide is an oxide which when combined with water gives off an acid.
  • A basic oxide is an oxide which when combined with water gives off a base.
  • When a substance reacts chemically, both as a base or acid it termed as an amphoteric solution.
  • Neutral Oxide is one which neither has an acidic characteristic nor a basic one.

Basic oxide

Metals react with oxygen to give basic compounds of oxygen. These compounds are usually ionic in nature. Group 1, 2 and lanthanides form basic compounds of oxygen when they react with dioxygen.

Na2O + H2O → 2NaOH

Acidic oxide:

B2O3 + H2O → 2H3BO3

Amphoteric oxide:

Al2O3 +2OH– + 3H2O → 2[Al (OH)4]–

Neutral Oxides:

Example: NO, CO.

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