Chemistry
Two elements 'P' and 'Q' belong to the same period of the modern periodic table and are in group 1 and group 2 respectively. Compare the following characteristics in tabular form.
(a) number of electrons in their valence shell.
(b) their tendency to lose electrons.
(c) their metallic characters.
(d) formation of their oxides.
(e) formulae of their chlorides.
Periodic Table
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Answer
These elements belong to alkali metals and alkaline earth metals, respectively. Below is the comparison of their characteristics:
| S. No. | Characteristic | Alkali metals (P) | Alkaline earth metals (Q) |
|---|---|---|---|
| (a) | Number of electrons in their valence shell | 1 | 2 |
| (b) | Tendency to lose electrons. | Can easily lose electrons | Loses electrons but relatively less easily than alkali metals. |
| (c) | Metallic character | Metallic | Less metallic than P |
| (d) | Formation of their oxides | React rapidly with oxygen in the air | Less reactive than alkali metals |
| (e) | Formulae of their chlorides | NaCl, KCl, CsCl | MgCl2, CaCl2, BaCl2 |
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