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.
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 |
Related Questions
Give the main characteristics of representative elements.
Discuss the characteristics of halogens with respect to:
(a) reactivity
(b) intensity of colours
(c) formation of ions.
Western music Do Re Me Fa So La Ti Indian music Sa Re Ga Ma Pa Dha Nee 1 2 3 4 5 6 7 H Li Be B C N O F Na Mg Al Si P S Cl K Ca Cr Ti Mn Fe (a) Name the scientist who gave this table.
(b) Which group of elements were not known at his time?
(c) This system worked quite well for the ………….. (heavier/lighter) elements.
(d) The table shown above relates the properties of the elements to their ………….. (atomic number / atomic mass)
(e) Why was this table discarded?
(a) Complete the table.
Atomic No Element Electronic configuration Select element of the same group 11 Sodium …………… (Ca/N/K) 15 Phosphorus …………… (Al/N/C) 16 Sulphur …………… (F/Cl/O) 9 Fluorine …………… (Ca/Cl/K) (b) Classify the elements given in the table as metals and non-metals.
(c) To which group does sodium belong? Why is Hydrogen not considered while describing the elements of this group?