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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
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 |
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
What are the elements.
Compare Modern Periodic Law with Mendeleev's Periodic Law.
Which of the following statements about the Modern periodic table is correct?
The modern periodic table is divided into which blocks?
Distinguish between:
s-block - p-block
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
