Question

Which of the following compounds have monoatomic ions?

• A. $NaCl$
• B. $A{l}_2{O}_3$
• C. $KCl$
• D. $CaO$

Answer 1

Answer: (A), (C)

The correct options are
A

$NaCl$

C

$KCl$

$NaCl=N{a}^{+}Cl-$ = Monoatomic ions as they have charge of 1+ and 1- respectively.

$A{l}_2{O}_3=A{l}^{3+}O2-$ = Polyatomic ions as they have charge of 3+ and 2- respectively.

$KCl=K^{+}C{l}^{-}$ = Monoatomic ions as they have charge of 1+ and 1- respectively.

$CaO=C{a}^{2+}{O}^{2-}$ = Diatomic ions as they have charge of 2+ and 2- respectively.