MCQ
An element E belongs to period 3 and group 2 will have:
- ✓three shells and two valence electrons
- Btwo shells and three valence electrons
- Cthree shells and three valence electrons
- Dtwo shells and two valence electrons
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| Group A | Group B |
| (a) Bauxite | (i) Iron |
| (b) Calamine | (ii) Aluminium |
| (c) Magnetite | (iii) Zinc |
| Soluble Salts | Acid | Insoluble salt | |
| W | $Pb \left( NO _3\right)_2$ | $H _2 SO _4$ | $PbSO _4$ |
| X | $BaCl _2$ | $H _2 SO _4$ | $BaSO _4$ |
| Y | $CaCl_2$ | $H _2 SO _4$ | $CaSO _4$ |
| Z | $NaNO _3$ | $H _2 SO _4$ | $NaHSO _4$ |