Question

Question 111

An atom changes to a charged particle called ion, if it loses or gains electrons. The charge on an ion is the charge on electrons plus charge on protons. Now, write the missing information in the table given below :
$\begin{array}{cccc}& & & \\ \text{Name of ion}& \text{Proton charge}& \text{Electron charge}& \text{Ion charge}\\ \text{(a) Hydroxide ion}& +9& -& -1\\ \text{(b) Sodium ion}& +11& -& +1\\ \text{(c) Aluminium ion}& +13& -10& -\\ \text{(d) Oxide ion}& +8& -10& -\end{array}$

Answer 1

(a) For Hydroxide ion,
proton charge + Electron charge = Ion charge
Electron charge = Ion charge - Proton charge
Electron charge = -1 -9 = -10
Hence, the electron charge in a Hydroxide ion is -10

(b) For Sodium ion.
Electron charge = Ion charge - Proton charge = +1 - 11 = -10
Hence, the electron charge in a Sodium ion is - 10.

(c) For Aluminium ion.
Ion charge = Proton charge + Electron charge
Ion charge = 13 - 10 = 3
Hence, the ion charge in an Aluminium ion is 3.

(d) For Oxide ion,
Ion charge = Proton charge + Electron charge
Ion charge = 8 - 10 = -2
Hence, the charge in an Oxide ion is -2