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प्रश्न
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
उत्तर
The valence electrons in the 1st group is 1 and that of the 2nd group is 2.
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संबंधित प्रश्न
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
For each of the following triads, name the element with the characteristics specified below:
| Elements | Least atomic radius | Chemically least reactive |
| (i) F, Cl, Br (ii) Li, Na, K |
.................... .................... |
.................... .................... |
Correct the statements.
Elements in the same periods have equal valency.
Name the non-metals present in period 2 and metals in period 3.
First ionization enthalpy of two elements X and Y are 500 KJ mol-1 and 375 KJ mol-1 respectively. Comment about their relative position in a group as well as in a period.
'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.
Select the correct answer
Identify the metalloid
Arrange the following in order of increasing radii:
N, O, P
Moving down in the second group, number of valence electrons ______.
Name or state following with reference to the element of the first three periods of the periodic table.
The valency of elements in group 1 [I–A].
