Question

what is the smallest atomic number of a metal (M) whose hydroxide is given as MOH?​

Answer 1

Li (lithium) forms LiOH

Answer 2

Answer:

The smallest atomic number of a metal whose hydroxide is given  $MOH$ is Lithium.

Explanation:

Metal hydroxides are compounds that contain metal (M) atoms bonded to oxygen atoms which is a part of hydroxide ions.

The Hydroxide ion is an anion (negatively charged ion) that can be bonded to a cation (positively charged ion).

Alkali and alkaline earth metals can easily undergo loss of electrons and can exist as cations.

Lithium is an element with an atomic number $3$ that can form a metal hydroxide when it is bonded to a hydroxide ion.

The metal hydroxide can be represented by the formula $LiOH$ and can be termed Lithium Hydroxide.

Hence the smallest atomic number of metals whose hydroxide is given  $MOH$ is Lithium.