Advertisements
Advertisements
प्रश्न
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 the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Advertisements
उत्तर
As elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, they belong to alkali metals and alkaline earth metals, respectively.
| Characteristic |
P |
Q |
|
(a) Number of electrons in their atoms |
Valence electron = 1 |
Valence electrons = 2 |
|
(b) Their tendency to lose electrons |
Can easily lose electrons |
They will lose electrons easily but not as easily as alkali metals can. |
|
(c) Their metallic characters |
P is more metallic |
Q is less metallic than P |
|
(d) Formation of their oxides |
React rapidly with oxygen in the air 4Na + O2 → 2Na2O |
Less reactive than alkali metals |
|
(e) Formulae of their chlorides |
NaCl, KCl, CsCl |
MgCl2, CaCl2, BaCl2 |
APPEARS IN
संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
|
Group 16
|
Group 17
|
|
−
|
−
|
|
−
|
A
|
|
−
|
−
|
|
B
|
C
|
(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
Give the chemical formula of calcium phosphate
Which of the following statements about the Modern periodic table is correct?
To the left of the zig-zag line in the periodic table are the metal elements.
______ and ______ are called inner transition elements.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Noble gas?
Define periods of modern periodic table.
