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प्रश्न
The position of elements A, B, C, D and E in the periodic table are shown below:
|
Group 1 |
Group 2 |
Group 17 |
Group 18 |
|
|
|
|
D |
|
|
B |
C |
|
|
A |
|
|
E |
State which is most reactive (i) metal (ii) non-metal
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उत्तर
Most reactive
(i) Metals: Alkali metals (Group I); Caesium
(ii) Non-metals: Halogens (Group 17); Fluorine
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संबंधित प्रश्न
The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is ______.
Arrange the following elements in increasing order of their atomic radii:
Li, Be, F, N
Arrange the following elements in the increasing order of their metallic character:
Mg, Ca, K, Ga
Which of the following set of elements is written correctly in the order of their increasing metallic character?
(a) Mg, Al, Si
(b) C, O, N
(c) Na, Li, K
(d) Be, Mg, Ca
Fill in the blank:
on moving from right to left in the second period, the number of valence electrons……….
What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?
Arrange the following as per instruction given in the bracket.
Li, K, Na, H ( decreasing order of their potential ionisation )
The electronic configuration of an element is 2, 8, 4. State it:
name and write its one physical property.
State the property trends in general of elements on moving down in a group of the periodic table.
