Question

Give an example each of monovalent and divalent elements.

Answer 1

monovalent
K+ -------------------- potassium
Na + ------------------sodium
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divalent 
Zn2+--------------------zinc
Mg2+ ------------------magnesium

Answer 2

Explanation:

Elements which have one valence or elements which have +1 charge are known as monovalent ion.

For example, $Na^{+}$, $K^{+}$ etc are monovalent ions.

Whereas elements which have two valence or elements which have +2 charge are known as divalent ion.

For example, $Mg^{2+}$, $Ca^{2+}$ etc are divalent ions.